Add latest changes from gitlab-org/gitlab@master

2 files changed, 1273 insertions, 7 deletions

diff --git a/glfm_specification/example_snapshots/html.yml b/glfm_specification/example_snapshots/html.yml
index 834dd49a934..105a0d26409 100644
--- a/glfm_specification/example_snapshots/html.yml
+++ b/glfm_specification/example_snapshots/html.yml
@@ -2144,6 +2144,7 @@
   static: |-
     <p data-sourcepos="3:1-3:5" dir="auto"><a href="/url" title="title">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url "title"</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__002:
   canonical: |
@@ -2151,6 +2152,7 @@
   static: |-
     <p data-sourcepos="5:1-5:5" dir="auto"><a href="/url" title="the title">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url "the title"</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="the title">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__003:
   canonical: |
@@ -2158,6 +2160,7 @@
   static: |-
     <p data-sourcepos="3:1-3:11" dir="auto"><a href="my_(url)" title="title (with parens)">Foo*bar]</a></p>
   wysiwyg: |-
+    <pre>[foo*bar\]]: my_(url) "title (with parens)"</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="my_(url)" title="title (with parens)">Foo*bar]</a></p>
 04_07__leaf_blocks__link_reference_definitions__004:
   canonical: |
@@ -2165,6 +2168,7 @@
   static: |-
     <p data-sourcepos="5:1-5:9" dir="auto"><a href="my%20url" title="title">Foo bar</a></p>
   wysiwyg: |-
+    <pre>[foo bar]: my url "title"</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="my%20url" title="title">Foo bar</a></p>
 04_07__leaf_blocks__link_reference_definitions__005:
   canonical: |
@@ -2180,6 +2184,11 @@
     line2
     ">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url "
+    title
+    line1
+    line2
+    "</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="
     title
     line1
@@ -2204,6 +2213,7 @@
   static: |-
     <p data-sourcepos="4:1-4:5" dir="auto"><a href="/url">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__008:
   canonical: |
@@ -2221,6 +2231,7 @@
   static: |-
     <p data-sourcepos="3:1-3:5" dir="auto"><a href="">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: </pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__010:
   canonical: |
@@ -2238,6 +2249,7 @@
   static: |-
     <p data-sourcepos="3:1-3:5" dir="auto"><a href="/url%5Cbar*baz" title='foo"bar\baz'>foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url\bar*baz "foo"bar\baz"</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url%5Cbar*baz" title="foo&quot;bar\baz">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__012:
   canonical: |
@@ -2246,6 +2258,7 @@
     <p data-sourcepos="1:1-1:5" dir="auto"><a href="url">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="url">foo</a></p>
+    <pre>[foo]: url</pre>
 04_07__leaf_blocks__link_reference_definitions__013:
   canonical: |
     <p><a href="first">foo</a></p>
@@ -2253,12 +2266,15 @@
     <p data-sourcepos="1:1-1:5" dir="auto"><a href="first">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="first">foo</a></p>
+    <pre>[foo]: first</pre>
+    <pre>[foo]: second</pre>
 04_07__leaf_blocks__link_reference_definitions__014:
   canonical: |
     <p><a href="/url">Foo</a></p>
   static: |-
     <p data-sourcepos="3:1-3:5" dir="auto"><a href="/url">Foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">Foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__015:
   canonical: |
@@ -2266,18 +2282,20 @@
   static: |-
     <p data-sourcepos="3:1-3:8" dir="auto"><a href="/%CF%86%CE%BF%CF%85">αγω</a></p>
   wysiwyg: |-
+    <pre>[αγω]: /φου</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/%CF%86%CE%BF%CF%85">αγω</a></p>
 04_07__leaf_blocks__link_reference_definitions__016:
   canonical: ""
   static: ""
   wysiwyg: |-
-    <p></p>
+    <pre>[foo]: /url</pre>
 04_07__leaf_blocks__link_reference_definitions__017:
   canonical: |
     <p>bar</p>
   static: |-
     <p data-sourcepos="1:1-4:3" dir="auto">bar</p>
   wysiwyg: |-
+    <pre>[foo]: /url</pre>
     <p>bar</p>
 04_07__leaf_blocks__link_reference_definitions__018:
   canonical: |
@@ -2292,6 +2310,7 @@
   static: |-
     <p data-sourcepos="1:1-2:10" dir="auto">"title" ok</p>
   wysiwyg: |-
+    <pre>[foo]: /url</pre>
     <p>"title" ok</p>
 04_07__leaf_blocks__link_reference_definitions__020:
   canonical: |
@@ -2349,6 +2368,7 @@
     </blockquote>
   wysiwyg: |-
     <h1><a target="_blank" rel="noopener noreferrer nofollow" href="/url">Foo</a></h1>
+    <pre>[foo]: /url</pre>
     <blockquote multiline="false"><p>bar</p></blockquote>
 04_07__leaf_blocks__link_reference_definitions__024:
   canonical: |
@@ -2359,6 +2379,7 @@
     <a id="user-content-bar" class="anchor" href="#bar" aria-hidden="true"></a>bar</h1>
     <p data-sourcepos="4:1-4:5" dir="auto"><a href="/url">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url</pre>
     <h1>bar</h1>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__025:
@@ -2369,6 +2390,7 @@
     <p data-sourcepos="1:1-3:5" dir="auto">===
     <a href="/url">foo</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url</pre>
     <p>===
     <a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo</a></p>
 04_07__leaf_blocks__link_reference_definitions__026:
@@ -2381,6 +2403,9 @@
     <a href="/bar-url" title="bar">bar</a>,
     <a href="/baz-url">baz</a></p>
   wysiwyg: |-
+    <pre>[foo]: /foo-url "foo"</pre>
+    <pre>[bar]: /bar-url "bar"</pre>
+    <pre>[baz]: /baz-url</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/foo-url" title="foo">foo</a>,
     <a target="_blank" rel="noopener noreferrer nofollow" href="/bar-url" title="bar">bar</a>,
     <a target="_blank" rel="noopener noreferrer nofollow" href="/baz-url">baz</a></p>
@@ -2395,12 +2420,12 @@
     </blockquote>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo</a></p>
-    <blockquote multiline="false"><p></p></blockquote>
+    <blockquote multiline="false"><pre>[foo]: /url</pre></blockquote>
 04_07__leaf_blocks__link_reference_definitions__028:
   canonical: ""
   static: ""
   wysiwyg: |-
-    <p></p>
+    <pre>[foo]: /url</pre>
 04_08__leaf_blocks__paragraphs__001:
   canonical: |
     <p>aaa</p>
@@ -4543,7 +4568,7 @@
     </li>
     </ul>
   wysiwyg: |-
-    <ul bullet="*"><li><p>a</p></li><li><p>b</p></li><li><p>d</p></li></ul>
+    <ul bullet="*"><li><p>a</p></li><li><p>b</p><pre>[ref]: /url</pre></li><li><p>d</p></li></ul>
 05_04__container_blocks__lists__018:
   canonical: |
     <ul>
@@ -4880,6 +4905,7 @@
     <p data-sourcepos="1:1-1:5" dir="auto"><a href="/bar*" title="ti*tle">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/bar*" title="ti*tle">foo</a></p>
+    <pre>[foo]: /bar* "ti*tle"</pre>
 06_02__inlines__backslash_escapes__013:
   canonical: |
     <pre><code class="language-foo+bar">foo
@@ -4969,6 +4995,7 @@
     <p data-sourcepos="1:1-1:5" dir="auto"><a href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/f%C3%B6%C3%B6" title="föö">foo</a></p>
+    <pre>[foo]: /föö "föö"</pre>
 06_03__inlines__entity_and_numeric_character_references__010:
   canonical: |
     <pre><code class="language-föö">foo
@@ -6475,6 +6502,7 @@
     <p data-sourcepos="1:1-1:10" dir="auto"><a href="/url" title="title">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a></p>
+    <pre>[bar]: /url "title"</pre>
 06_07__inlines__links__044:
   canonical: |
     <p><a href="/uri">link [foo [bar]]</a></p>
@@ -6482,6 +6510,7 @@
     <p data-sourcepos="1:1-1:23" dir="auto"><a href="/uri">link [foo [bar]]</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri">link [foo [bar]]</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__045:
   canonical: |
     <p><a href="/uri">link [bar</a></p>
@@ -6489,6 +6518,7 @@
     <p data-sourcepos="1:1-1:17" dir="auto"><a href="/uri">link [bar</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri">link [bar</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__046:
   canonical: |
     <p><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
@@ -6496,6 +6526,7 @@
     <p data-sourcepos="1:1-1:29" dir="auto"><a href="/uri">link <em>foo <strong>bar</strong> <code>#</code></em></a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri">link <em>foo </em><strong><em>bar<code>#</code></em></strong></a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__047:
   canonical: |
     <p><a href="/uri"><img src="moon.jpg" alt="moon" /></a></p>
@@ -6503,6 +6534,7 @@
     <p data-sourcepos="1:1-1:24" dir="auto"><a href="/uri"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="moon" decoding="async" class="lazy" data-src="moon.jpg"></a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri"><img src="moon.jpg" alt="moon"></a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__048:
   canonical: |
     <p>[foo <a href="/uri">bar</a>]<a href="/uri">ref</a></p>
@@ -6510,6 +6542,7 @@
     <p data-sourcepos="1:1-1:22" dir="auto">[foo <a href="/uri">bar</a>]<a href="/uri">ref</a></p>
   wysiwyg: |-
     <p>[foo <a target="_blank" rel="noopener noreferrer nofollow" href="/uri">bar</a>]<a target="_blank" rel="noopener noreferrer nofollow" href="/uri">ref</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__049:
   canonical: |
     <p>[foo <em>bar <a href="/uri">baz</a></em>]<a href="/uri">ref</a></p>
@@ -6517,6 +6550,7 @@
     <p data-sourcepos="1:1-1:27" dir="auto">[foo <em>bar <a href="/uri">baz</a></em>]<a href="/uri">ref</a></p>
   wysiwyg: |-
     <p>[foo <em>bar </em><a target="_blank" rel="noopener noreferrer nofollow" href="/uri"><em>baz</em></a>]<a target="_blank" rel="noopener noreferrer nofollow" href="/uri">ref</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__050:
   canonical: |
     <p>*<a href="/uri">foo*</a></p>
@@ -6524,6 +6558,7 @@
     <p data-sourcepos="1:1-1:12" dir="auto">*<a href="/uri">foo*</a></p>
   wysiwyg: |-
     <p>*<a target="_blank" rel="noopener noreferrer nofollow" href="/uri">foo*</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__051:
   canonical: |
     <p><a href="/uri">foo *bar</a></p>
@@ -6531,6 +6566,7 @@
     <p data-sourcepos="1:1-1:15" dir="auto"><a href="/uri">foo *bar</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri">foo *bar</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__052:
   canonical: |
     <p>[foo <bar attr="][ref]"></p>
@@ -6538,6 +6574,7 @@
     <p data-sourcepos="1:1-1:24" dir="auto">[foo </p>
   wysiwyg: |-
     <p>[foo </p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__053:
   canonical: |
     <p>[foo<code>][ref]</code></p>
@@ -6545,6 +6582,7 @@
     <p data-sourcepos="1:1-1:12" dir="auto">[foo<code>][ref]</code></p>
   wysiwyg: |-
     <p>[foo<code>][ref]</code></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__054:
   canonical: |
     <p>[foo<a href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
@@ -6552,6 +6590,7 @@
     <p data-sourcepos="1:1-1:39" dir="auto">[foo<a href="http://example.com/?search=%5D%5Bref%5D" rel="nofollow noreferrer noopener" target="_blank">http://example.com/?search=][ref]</a></p>
   wysiwyg: |-
     <p>[foo<a target="_blank" rel="noopener noreferrer nofollow" href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
+    <pre>[ref]: /uri</pre>
 06_07__inlines__links__055:
   canonical: |
     <p><a href="/url" title="title">foo</a></p>
@@ -6559,6 +6598,7 @@
     <p data-sourcepos="1:1-1:10" dir="auto"><a href="/url" title="title">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a></p>
+    <pre>[bar]: /url "title"</pre>
 06_07__inlines__links__056:
   canonical: |
     <p><a href="/url">Толпой</a> is a Russian word.</p>
@@ -6566,12 +6606,14 @@
     <p data-sourcepos="1:1-1:47" dir="auto"><a href="/url">Толпой</a> is a Russian word.</p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">Толпой</a> is a Russian word.</p>
+    <pre>[толпой]: /url</pre>
 06_07__inlines__links__057:
   canonical: |
     <p><a href="/url">Baz</a></p>
   static: |-
     <p data-sourcepos="4:1-4:14" dir="auto"><a href="/url">Baz</a></p>
   wysiwyg: |-
+    <pre>[foo bar]: /url</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">Baz</a></p>
 06_07__inlines__links__058:
   canonical: |
@@ -6580,6 +6622,7 @@
     <p data-sourcepos="1:1-1:11" dir="auto">[foo] <a href="/url" title="title">bar</a></p>
   wysiwyg: |-
     <p>[foo] <a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">bar</a></p>
+    <pre>[bar]: /url "title"</pre>
 06_07__inlines__links__059:
   canonical: |
     <p>[foo]
@@ -6590,12 +6633,15 @@
   wysiwyg: |-
     <p>[foo]
     <a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">bar</a></p>
+    <pre>[bar]: /url "title"</pre>
 06_07__inlines__links__060:
   canonical: |
     <p><a href="/url1">bar</a></p>
   static: |-
     <p data-sourcepos="5:1-5:10" dir="auto"><a href="/url1">bar</a></p>
   wysiwyg: |-
+    <pre>[foo]: /url1</pre>
+    <pre>[foo]: /url2</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url1">bar</a></p>
 06_07__inlines__links__061:
   canonical: |
@@ -6604,6 +6650,7 @@
     <p data-sourcepos="1:1-1:32" dir="auto">[bar][foo<span>!</span>]</p>
   wysiwyg: |-
     <p>[bar][foo!]</p>
+    <pre>[foo!]: /url</pre>
 06_07__inlines__links__062:
   canonical: |
     <p>[foo][ref[]</p>
@@ -6641,12 +6688,14 @@
     <p data-sourcepos="1:1-1:12" dir="auto"><a href="/uri">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri">foo</a></p>
+    <pre>[ref\[]: /uri</pre>
 06_07__inlines__links__066:
   canonical: |
     <p><a href="/uri">bar\</a></p>
   static: |-
     <p data-sourcepos="3:1-3:7" dir="auto"><a href="/uri">bar\</a></p>
   wysiwyg: |-
+    <pre>[bar\\]: /uri</pre>
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/uri">bar\</a></p>
 06_07__inlines__links__067:
   canonical: |
@@ -6681,6 +6730,7 @@
     <p data-sourcepos="1:1-1:7" dir="auto"><a href="/url" title="title">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a></p>
+    <pre>[foo]: /url "title"</pre>
 06_07__inlines__links__070:
   canonical: |
     <p><a href="/url" title="title"><em>foo</em> bar</a></p>
@@ -6688,6 +6738,7 @@
     <p data-sourcepos="1:1-1:13" dir="auto"><a href="/url" title="title"><em>foo</em> bar</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title"><em>foo</em> bar</a></p>
+    <pre>[*foo* bar]: /url "title"</pre>
 06_07__inlines__links__071:
   canonical: |
     <p><a href="/url" title="title">Foo</a></p>
@@ -6695,6 +6746,7 @@
     <p data-sourcepos="1:1-1:7" dir="auto"><a href="/url" title="title">Foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">Foo</a></p>
+    <pre>[foo]: /url "title"</pre>
 06_07__inlines__links__072:
   canonical: |
     <p><a href="/url" title="title">foo</a>
@@ -6705,6 +6757,7 @@
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a>
     []</p>
+    <pre>[foo]: /url "title"</pre>
 06_07__inlines__links__073:
   canonical: |
     <p><a href="/url" title="title">foo</a></p>
@@ -6712,6 +6765,7 @@
     <p data-sourcepos="1:1-1:5" dir="auto"><a href="/url" title="title">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a></p>
+    <pre>[foo]: /url "title"</pre>
 06_07__inlines__links__074:
   canonical: |
     <p><a href="/url" title="title"><em>foo</em> bar</a></p>
@@ -6719,6 +6773,7 @@
     <p data-sourcepos="1:1-1:11" dir="auto"><a href="/url" title="title"><em>foo</em> bar</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title"><em>foo</em> bar</a></p>
+    <pre>[*foo* bar]: /url "title"</pre>
 06_07__inlines__links__075:
   canonical: |
     <p>[<a href="/url" title="title"><em>foo</em> bar</a>]</p>
@@ -6726,6 +6781,7 @@
     <p data-sourcepos="1:1-1:13" dir="auto">[<a href="/url" title="title"><em>foo</em> bar</a>]</p>
   wysiwyg: |-
     <p>[<a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title"><em>foo</em> bar</a>]</p>
+    <pre>[*foo* bar]: /url "title"</pre>
 06_07__inlines__links__076:
   canonical: |
     <p>[[bar <a href="/url">foo</a></p>
@@ -6733,6 +6789,7 @@
     <p data-sourcepos="1:1-1:11" dir="auto">[[bar <a href="/url">foo</a></p>
   wysiwyg: |-
     <p>[[bar <a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo</a></p>
+    <pre>[foo]: /url</pre>
 06_07__inlines__links__077:
   canonical: |
     <p><a href="/url" title="title">Foo</a></p>
@@ -6740,6 +6797,7 @@
     <p data-sourcepos="1:1-1:5" dir="auto"><a href="/url" title="title">Foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">Foo</a></p>
+    <pre>[foo]: /url "title"</pre>
 06_07__inlines__links__078:
   canonical: |
     <p><a href="/url">foo</a> bar</p>
@@ -6747,6 +6805,7 @@
     <p data-sourcepos="1:1-1:9" dir="auto"><a href="/url">foo</a> bar</p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo</a> bar</p>
+    <pre>[foo]: /url</pre>
 06_07__inlines__links__079:
   canonical: |
     <p>[foo]</p>
@@ -6754,12 +6813,14 @@
     <p data-sourcepos="1:1-1:6" dir="auto">[foo]</p>
   wysiwyg: |-
     <p>[foo]</p>
+    <pre>[foo]: /url "title"</pre>
 06_07__inlines__links__080:
   canonical: |
     <p>*<a href="/url">foo*</a></p>
   static: |-
     <p data-sourcepos="3:1-3:7" dir="auto">*<a href="/url">foo*</a></p>
   wysiwyg: |-
+    <pre>[foo*]: /url</pre>
     <p>*<a target="_blank" rel="noopener noreferrer nofollow" href="/url">foo*</a></p>
 06_07__inlines__links__081:
   canonical: |
@@ -6768,6 +6829,8 @@
     <p data-sourcepos="1:1-1:10" dir="auto"><a href="/url2">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url2">foo</a></p>
+    <pre>[foo]: /url1</pre>
+    <pre>[bar]: /url2</pre>
 06_07__inlines__links__082:
   canonical: |
     <p><a href="/url1">foo</a></p>
@@ -6775,6 +6838,7 @@
     <p data-sourcepos="1:1-1:7" dir="auto"><a href="/url1">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url1">foo</a></p>
+    <pre>[foo]: /url1</pre>
 06_07__inlines__links__083:
   canonical: |
     <p><a href="">foo</a></p>
@@ -6782,6 +6846,7 @@
     <p data-sourcepos="1:1-1:7" dir="auto"><a href="">foo</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="">foo</a></p>
+    <pre>[foo]: /url1</pre>
 06_07__inlines__links__084:
   canonical: |
     <p><a href="/url1">foo</a>(not a link)</p>
@@ -6789,6 +6854,7 @@
     <p data-sourcepos="1:1-1:17" dir="auto"><a href="/url1">foo</a>(not a link)</p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url1">foo</a>(not a link)</p>
+    <pre>[foo]: /url1</pre>
 06_07__inlines__links__085:
   canonical: |
     <p>[foo]<a href="/url">bar</a></p>
@@ -6796,6 +6862,7 @@
     <p data-sourcepos="1:1-1:15" dir="auto">[foo]<a href="/url">bar</a></p>
   wysiwyg: |-
     <p>[foo]<a target="_blank" rel="noopener noreferrer nofollow" href="/url">bar</a></p>
+    <pre>[baz]: /url</pre>
 06_07__inlines__links__086:
   canonical: |
     <p><a href="/url2">foo</a><a href="/url1">baz</a></p>
@@ -6803,6 +6870,8 @@
     <p data-sourcepos="1:1-1:15" dir="auto"><a href="/url2">foo</a><a href="/url1">baz</a></p>
   wysiwyg: |-
     <p><a target="_blank" rel="noopener noreferrer nofollow" href="/url2">foo</a><a target="_blank" rel="noopener noreferrer nofollow" href="/url1">baz</a></p>
+    <pre>[baz]: /url1</pre>
+    <pre>[bar]: /url2</pre>
 06_07__inlines__links__087:
   canonical: |
     <p>[foo]<a href="/url1">bar</a></p>
@@ -6810,6 +6879,8 @@
     <p data-sourcepos="1:1-1:15" dir="auto">[foo]<a href="/url1">bar</a></p>
   wysiwyg: |-
     <p>[foo]<a target="_blank" rel="noopener noreferrer nofollow" href="/url1">bar</a></p>
+    <pre>[baz]: /url1</pre>
+    <pre>[foo]: /url2</pre>
 06_08__inlines__images__001:
   canonical: |
     <p><img src="/url" alt="foo" title="title" /></p>
@@ -6824,6 +6895,7 @@
     <p data-sourcepos="1:1-1:12" dir="auto"><a class="no-attachment-icon" href="train.jpg" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo bar" title="train &amp; tracks" decoding="async" class="lazy" data-src="train.jpg"></a></p>
   wysiwyg: |-
     <p><img src="train.jpg" alt="foo bar" title="train &amp; tracks"></p>
+    <pre>[foo *bar*]: train.jpg "train &amp; tracks"</pre>
 06_08__inlines__images__003:
   canonical: |
     <p><img src="/url2" alt="foo bar" /></p>
@@ -6845,6 +6917,7 @@
     <p data-sourcepos="1:1-1:14" dir="auto"><a class="no-attachment-icon" href="train.jpg" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo bar" title="train &amp; tracks" decoding="async" class="lazy" data-src="train.jpg"></a></p>
   wysiwyg: |-
     <p><img src="train.jpg" alt="foo bar" title="train &amp; tracks"></p>
+    <pre>[foo *bar*]: train.jpg "train &amp; tracks"</pre>
 06_08__inlines__images__006:
   canonical: |
     <p><img src="train.jpg" alt="foo bar" title="train &amp; tracks" /></p>
@@ -6852,6 +6925,7 @@
     <p data-sourcepos="1:1-1:20" dir="auto"><a class="no-attachment-icon" href="train.jpg" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo bar" title="train &amp; tracks" decoding="async" class="lazy" data-src="train.jpg"></a></p>
   wysiwyg: |-
     <p><img src="train.jpg" alt="foo bar" title="train &amp; tracks"></p>
+    <pre>[foobar]: train.jpg "train &amp; tracks"</pre>
 06_08__inlines__images__007:
   canonical: |
     <p><img src="train.jpg" alt="foo" /></p>
@@ -6887,6 +6961,7 @@
     <p data-sourcepos="1:1-1:11" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="foo"></p>
+    <pre>[bar]: /url</pre>
 06_08__inlines__images__012:
   canonical: |
     <p><img src="/url" alt="foo" /></p>
@@ -6894,6 +6969,7 @@
     <p data-sourcepos="1:1-1:11" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="foo"></p>
+    <pre>[bar]: /url</pre>
 06_08__inlines__images__013:
   canonical: |
     <p><img src="/url" alt="foo" title="title" /></p>
@@ -6901,6 +6977,7 @@
     <p data-sourcepos="1:1-1:8" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo" title="title" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="foo" title="title"></p>
+    <pre>[foo]: /url "title"</pre>
 06_08__inlines__images__014:
   canonical: |
     <p><img src="/url" alt="foo bar" title="title" /></p>
@@ -6908,6 +6985,7 @@
     <p data-sourcepos="1:1-1:14" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo bar" title="title" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="foo bar" title="title"></p>
+    <pre>[*foo* bar]: /url "title"</pre>
 06_08__inlines__images__015:
   canonical: |
     <p><img src="/url" alt="Foo" title="title" /></p>
@@ -6915,6 +6993,7 @@
     <p data-sourcepos="1:1-1:8" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="Foo" title="title" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="Foo" title="title"></p>
+    <pre>[foo]: /url "title"</pre>
 06_08__inlines__images__016:
   canonical: |
     <p><img src="/url" alt="foo" title="title" />
@@ -6925,6 +7004,7 @@
   wysiwyg: |-
     <p><img src="/url" alt="foo" title="title">
     []</p>
+    <pre>[foo]: /url "title"</pre>
 06_08__inlines__images__017:
   canonical: |
     <p><img src="/url" alt="foo" title="title" /></p>
@@ -6932,6 +7012,7 @@
     <p data-sourcepos="1:1-1:6" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo" title="title" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="foo" title="title"></p>
+    <pre>[foo]: /url "title"</pre>
 06_08__inlines__images__018:
   canonical: |
     <p><img src="/url" alt="foo bar" title="title" /></p>
@@ -6939,6 +7020,7 @@
     <p data-sourcepos="1:1-1:12" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="foo bar" title="title" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="foo bar" title="title"></p>
+    <pre>[*foo* bar]: /url "title"</pre>
 06_08__inlines__images__019:
   canonical: |
     <p>![[foo]]</p>
@@ -6956,6 +7038,7 @@
     <p data-sourcepos="1:1-1:6" dir="auto"><a class="no-attachment-icon" href="/url" target="_blank" rel="noopener noreferrer"><img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="Foo" title="title" decoding="async" class="lazy" data-src="/url"></a></p>
   wysiwyg: |-
     <p><img src="/url" alt="Foo" title="title"></p>
+    <pre>[foo]: /url "title"</pre>
 06_08__inlines__images__021:
   canonical: |
     <p>![foo]</p>
@@ -6963,6 +7046,7 @@
     <p data-sourcepos="1:1-1:7" dir="auto">![foo]</p>
   wysiwyg: |-
     <p>![foo]</p>
+    <pre>[foo]: /url "title"</pre>
 06_08__inlines__images__022:
   canonical: |
     <p>!<a href="/url" title="title">foo</a></p>
@@ -6970,6 +7054,7 @@
     <p data-sourcepos="1:1-1:27" dir="auto"><span>!</span><a href="/url" title="title">foo</a></p>
   wysiwyg: |-
     <p>!<a target="_blank" rel="noopener noreferrer nofollow" href="/url" title="title">foo</a></p>
+    <pre>[foo]: /url "title"</pre>
 06_09__inlines__autolinks__001:
   canonical: |
     <p><a href="http://foo.bar.baz">http://foo.bar.baz</a></p>
diff --git a/glfm_specification/example_snapshots/prosemirror_json.yml b/glfm_specification/example_snapshots/prosemirror_json.yml
index f770d341c42..7cb4757b368 100644
--- a/glfm_specification/example_snapshots/prosemirror_json.yml
+++ b/glfm_specification/example_snapshots/prosemirror_json.yml
@@ -3884,6 +3884,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -3911,6 +3925,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "the title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"the title\""
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -3938,6 +3966,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo*bar\\]",
+          "url": "my_(url)",
+          "title": "title (with parens)"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo*bar\\]]: my_(url) \"title (with parens)\""
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -3965,6 +4007,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo bar",
+          "url": "my url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo bar]: my url \"title\""
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -3992,6 +4048,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "\ntitle\nline1\nline2\n"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"\ntitle\nline1\nline2\n\""
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4052,6 +4122,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4103,6 +4187,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: "
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4154,6 +4252,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url\\bar*baz",
+          "title": "foo\"bar\\baz"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url\\bar*baz \"foo\"bar\\baz\""
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4200,6 +4312,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: url"
+          }
+        ]
       }
     ]
   }
@@ -4227,6 +4353,34 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "first",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: first"
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "second",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: second"
+          }
+        ]
       }
     ]
   }
@@ -4235,6 +4389,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4262,6 +4430,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "αγω",
+          "url": "/φου",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[αγω]: /φου"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4289,7 +4471,18 @@
     "type": "doc",
     "content": [
       {
-        "type": "paragraph"
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
       }
     ]
   }
@@ -4298,6 +4491,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4328,6 +4535,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4447,6 +4668,20 @@
         ]
       },
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "blockquote",
         "attrs": {
           "multiline": false
@@ -4470,6 +4705,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "heading",
         "attrs": {
           "level": 1
@@ -4509,6 +4758,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4540,6 +4803,48 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/foo-url",
+          "title": "foo"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /foo-url \"foo\""
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/bar-url",
+          "title": "bar"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /bar-url \"bar\""
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "baz",
+          "url": "/baz-url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[baz]: /baz-url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -4634,7 +4939,18 @@
         },
         "content": [
           {
-            "type": "paragraph"
+            "type": "referenceDefinition",
+            "attrs": {
+              "identifier": "foo",
+              "url": "/url",
+              "title": null
+            },
+            "content": [
+              {
+                "type": "text",
+                "text": "[foo]: /url"
+              }
+            ]
           }
         ]
       }
@@ -4645,7 +4961,18 @@
     "type": "doc",
     "content": [
       {
-        "type": "paragraph"
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
       }
     ]
   }
@@ -9572,6 +9899,20 @@
                     "text": "b"
                   }
                 ]
+              },
+              {
+                "type": "referenceDefinition",
+                "attrs": {
+                  "identifier": "ref",
+                  "url": "/url",
+                  "title": null
+                },
+                "content": [
+                  {
+                    "type": "text",
+                    "text": "[ref]: /url"
+                  }
+                ]
               }
             ]
           },
@@ -10416,6 +10757,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/bar*",
+          "title": "ti*tle"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /bar* \"ti*tle\""
+          }
+        ]
       }
     ]
   }
@@ -10588,6 +10943,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/föö",
+          "title": "föö"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /föö \"föö\""
+          }
+        ]
       }
     ]
   }
@@ -15592,6 +15961,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -15619,6 +16002,20 @@
             "text": "link [foo [bar]]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15646,6 +16043,20 @@
             "text": "link [bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15739,6 +16150,20 @@
             "text": "#"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15772,6 +16197,20 @@
             ]
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15823,6 +16262,20 @@
             "text": "ref"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15886,6 +16339,20 @@
             "text": "ref"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15917,6 +16384,20 @@
             "text": "foo*"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15944,6 +16425,20 @@
             "text": "foo *bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15959,6 +16454,20 @@
             "text": "[foo "
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -15983,6 +16492,20 @@
             "text": "][ref]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -16014,6 +16537,20 @@
             "text": "http://example.com/?search=][ref]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -16041,6 +16578,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16072,6 +16623,20 @@
             "text": " is a Russian word."
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "толпой",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[толпой]: /url"
+          }
+        ]
       }
     ]
   }
@@ -16080,6 +16645,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo bar",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo bar]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -16130,6 +16709,20 @@
             "text": "bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16161,6 +16754,20 @@
             "text": "bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16169,6 +16776,34 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url1"
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url2",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url2"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -16203,6 +16838,20 @@
             "text": "[bar][foo!]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo!",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo!]: /url"
+          }
+        ]
       }
     ]
   }
@@ -16302,6 +16951,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "ref\\[",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[ref\\[]: /uri"
+          }
+        ]
       }
     ]
   }
@@ -16310,6 +16973,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar\\\\",
+          "url": "/uri",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar\\\\]: /uri"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -16404,6 +17081,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16450,6 +17141,20 @@
             "text": " bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "*foo* bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[*foo* bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16477,6 +17182,20 @@
             "text": "Foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16508,6 +17227,20 @@
             "text": "\n[]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16535,6 +17268,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16581,6 +17328,20 @@
             "text": " bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "*foo* bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[*foo* bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16635,6 +17396,20 @@
             "text": "]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "*foo* bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[*foo* bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16666,6 +17441,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
       }
     ]
   }
@@ -16693,6 +17482,20 @@
             "text": "Foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16724,6 +17527,20 @@
             "text": " bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url"
+          }
+        ]
       }
     ]
   }
@@ -16739,6 +17556,20 @@
             "text": "[foo]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -16747,6 +17578,20 @@
     "type": "doc",
     "content": [
       {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo*",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo*]: /url"
+          }
+        ]
+      },
+      {
         "type": "paragraph",
         "content": [
           {
@@ -16797,6 +17642,34 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url1"
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url2",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url2"
+          }
+        ]
       }
     ]
   }
@@ -16824,6 +17697,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url1"
+          }
+        ]
       }
     ]
   }
@@ -16851,6 +17738,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url1"
+          }
+        ]
       }
     ]
   }
@@ -16882,6 +17783,20 @@
             "text": "(not a link)"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url1"
+          }
+        ]
       }
     ]
   }
@@ -16913,6 +17828,20 @@
             "text": "bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "baz",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[baz]: /url"
+          }
+        ]
       }
     ]
   }
@@ -16956,6 +17885,34 @@
             "text": "baz"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "baz",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[baz]: /url1"
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url2",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url2"
+          }
+        ]
       }
     ]
   }
@@ -16987,6 +17944,34 @@
             "text": "bar"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "baz",
+          "url": "/url1",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[baz]: /url1"
+          }
+        ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url2",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url2"
+          }
+        ]
       }
     ]
   }
@@ -17029,6 +18014,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo *bar*",
+          "url": "train.jpg",
+          "title": "train & tracks"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo *bar*]: train.jpg \"train & tracks\""
+          }
+        ]
       }
     ]
   }
@@ -17092,6 +18091,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo *bar*",
+          "url": "train.jpg",
+          "title": "train & tracks"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo *bar*]: train.jpg \"train & tracks\""
+          }
+        ]
       }
     ]
   }
@@ -17113,6 +18126,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foobar",
+          "url": "train.jpg",
+          "title": "train & tracks"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foobar]: train.jpg \"train & tracks\""
+          }
+        ]
       }
     ]
   }
@@ -17222,6 +18249,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url"
+          }
+        ]
       }
     ]
   }
@@ -17243,6 +18284,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "bar",
+          "url": "/url",
+          "title": null
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[bar]: /url"
+          }
+        ]
       }
     ]
   }
@@ -17264,6 +18319,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17285,6 +18354,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "*foo* bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[*foo* bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17306,6 +18389,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17331,6 +18428,20 @@
             "text": "\n[]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17352,6 +18463,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17373,6 +18498,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "*foo* bar",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[*foo* bar]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17418,6 +18557,20 @@
             }
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17433,6 +18586,20 @@
             "text": "![foo]"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }
@@ -17464,6 +18631,20 @@
             "text": "foo"
           }
         ]
+      },
+      {
+        "type": "referenceDefinition",
+        "attrs": {
+          "identifier": "foo",
+          "url": "/url",
+          "title": "title"
+        },
+        "content": [
+          {
+            "type": "text",
+            "text": "[foo]: /url \"title\""
+          }
+        ]
       }
     ]
   }