Invalid XHTML at lines 4561-4564 and 4583-4586 of wp-includes/formatting.php

[sephr]

There is invalid XHTML at lines 4561-4564 and 4583-4586 of wp-includes/formatting.php (see ​https://github.com/WordPress/WordPress/blob/d11514485719f41469daff6cde3f3006bd35b58a/wp-includes/formatting.php#L4561-L4564 and ​https://github.com/WordPress/WordPress/blob/d11514485719f41469daff6cde3f3006bd35b58a/wp-includes/formatting.php#L4583-L4586 )

These script blocks need to be escaped with /*<![CDATA[*/ ..script content.. /*]]>*/
Otherwise it will cause rendering errors for people serving XHTML as application/xhtml+xml

WordPress was not always like this, as 5 years ago when I made my strict XHTMl theme there were no errors. For a few years I had XHTML disabled for DISQUS compatibility. I recently re-enabled serving as application/xhtml+xml and to my surprise find this regression in the WP codebase.

[SergeyBiryukov]

Related: #36036

[subharanjan]

Added CDATA

[sephr]

Covered in the formatting.php section of https://core.trac.wordpress.org/attachment/ticket/36036/patch-reduced-js.diff for #36036

[SergeyBiryukov]

Duplicate of #36036.

Cool, let's merge them then :)