fix <script> text content serialization in incremental html mode

2 files changed, 22 insertions, 1 deletions

diff --git a/src/lxml/serializer.pxi b/src/lxml/serializer.pxi
index a3d22365..489ed2de 100644
--- a/src/lxml/serializer.pxi
+++ b/src/lxml/serializer.pxi
@@ -954,7 +954,14 @@ cdef class _IncrementalFileWriter:
                     if self._status > WRITER_IN_ELEMENT or content.strip():
                         raise LxmlSyntaxError("not in an element")
                 content = _utf8(content)
-                tree.xmlOutputBufferWriteEscape(self._c_out, _xcstr(content), NULL)
+
+                ns, name, _, _ = self._element_stack[-1]
+                if c_method == OUTPUT_METHOD_HTML and \
+                        ns in (None, 'http://www.w3.org/1999/xhtml') and name in ('script', 'style'):
+                    tree.xmlOutputBufferWrite(self._c_out, len(content), content)
+                else:
+                    tree.xmlOutputBufferWriteEscape(self._c_out, _xcstr(content), NULL)
+
             elif iselement(content):
                 if self._status > WRITER_IN_ELEMENT:
                     raise LxmlSyntaxError("cannot append trailing element to complete XML document")
diff --git a/src/lxml/tests/test_incremental_xmlfile.py b/src/lxml/tests/test_incremental_xmlfile.py
index b6245618..414edd12 100644
--- a/src/lxml/tests/test_incremental_xmlfile.py
+++ b/src/lxml/tests/test_incremental_xmlfile.py
@@ -418,6 +418,20 @@ class HtmlFileTestCase(_XmlFileTestCaseBase):
             '</root>')
         self._file = BytesIO()
 
+    def test_unescaped_script(self):
+        with etree.htmlfile(self._file) as xf:
+            elt = etree.Element('script')
+            elt.text = "if (a < b);"
+            xf.write(elt)
+        self.assertXml('<script>if (a < b);</script>')
+
+    def test_unescaped_script_incremental(self):
+        with etree.htmlfile(self._file) as xf:
+            with xf.element('script'):
+                xf.write("if (a < b);")
+
+        self.assertXml('<script>if (a < b);</script>')
+
     def test_write_declaration(self):
         with etree.htmlfile(self._file) as xf:
             try: