include syntax highlighted code blocks

functions/parse_page.js

@@ -57,6 +57,7 @@ const removeClasses = [
 const removeClassesExceptions = [
 	'div.main-page-tag-lcs',
 	'div.lcs-container',
+	'div.mw-highlight',
 	'div.poem',
 	'div.treeview',
 	'div.wikibase-entityview',
@@ -385,4 +386,4 @@ function parse_page(lang, msg, content, embed, wiki, reaction, {title, contentmo
 	} );
 }
 
-module.exports = parse_page;
+module.exports = parse_page;