1 files changed, 8 insertions, 2 deletions

diff --git a/app/assets/javascripts/content_editor/services/serialization_helpers.js b/app/assets/javascripts/content_editor/services/serialization_helpers.js
index 88f5192af77..7d5e718b41c 100644
--- a/app/assets/javascripts/content_editor/services/serialization_helpers.js
+++ b/app/assets/javascripts/content_editor/services/serialization_helpers.js
@@ -5,6 +5,8 @@ const defaultAttrs = {
   th: { colspan: 1, rowspan: 1, colwidth: null },
 };
 
+const defaultIgnoreAttrs = ['sourceMarkdown', 'sourceMapKey'];
+
 const ignoreAttrs = {
   dd: ['isTerm'],
   dt: ['isTerm'],
@@ -101,13 +103,17 @@ function htmlEncode(str = '') {
     .replace(/"/g, '"');
 }
 
+const shouldIgnoreAttr = (tagName, attrKey, attrValue) =>
+  ignoreAttrs[tagName]?.includes(attrKey) ||
+  defaultIgnoreAttrs.includes(attrKey) ||
+  defaultAttrs[tagName]?.[attrKey] === attrValue;
+
 export function openTag(tagName, attrs) {
   let str = `<${tagName}`;
 
   str += Object.entries(attrs || {})
     .map(([key, value]) => {
-      if ((ignoreAttrs[tagName] || []).includes(key) || defaultAttrs[tagName]?.[key] === value)
-        return '';
+      if (shouldIgnoreAttr(tagName, key, value)) return '';
 
       return ` ${key}="${htmlEncode(value?.toString())}"`;
     })