CSS style displays in list view, when content contains inline CSS

I don't see a difference between the two code blocks, and no CDATA in them, or I am missing the point. Can you explain in a little more detail to correct my misunderstanding, or, update the code blocks?

This issue is written as if the behavior is a regression. When and in what version of Drupal was it different?

Thanks in advance for the updates. 👋

I went ahead and updated the code blocks, sorry for the confusion.
Note also when viewing in a list view in 10.1 the style tags is shown as /**/, whereas now in 10.2 the inline CSS style displays instead. Like below:

.testing { background-color: #FFC; border: thin solid #CCC; padding: 10px; width:90%; margin-left:5%; margin-right:5% }
Testing 123 data.

When viewing the node itself, if you inspect the text above it you'll see the inline

There is not an html.php in Drupal. What is html.php referring-to in the issue title?

Did you look over the Drupal 10.2.0 release notes → ? This seems an intentional change in HTML utility classes → .

I thought so as well initially after reading the release notes.

After further debugging, notice in my MR, that I have only made two lines of updates and it should fixed this issue.
This fix will still also go thru the intentional changed in HTML utility though, it's before the serializing of the body using the custom set of rules in
\Masterminds\HTML5::saveHTML() process.

The Html.php is located in core/lib/Drupal/Component/Utility/Html.php.

ron-g → changed the visibility of the branch 3440034-cdata-is-not to hidden.

ron-g → changed the visibility of the branch 3440034-cdata-is-not to active.

ron-g → changed the visibility of the branch 3440034-cdata-is-not to hidden.

Unfortunately I do not understand comment #9.

Please test this again on the most current 10.2.5 Someone mentioned a similar regression on this issue: https://www.drupal.org/project/drupal/issues/3433#comment-15527161 ✨ Use CDATA in XML RSS Feeds (was: Malformed XML Feeds) Needs review but mentioned it started working again on 10.2.4

Thank you for that @nicxvan.

Oh Html.php, with a capital “H”.

Yes, with a capital "H", pls lemme know if you were able to replicate the issue.

CDATA was required by XHTML, but the web is now HTML5 and CDATA is no longer required: https://stackoverflow.com/questions/3302648/should-i-use-cdata-in-html5

In Drupal 10.2 we switched from using XHTML parsing and filtering to HTML5. However it appears that in this case the contents of a style tag was previously hidden by the CDATA wrapper, where the style tag itself was stripped presumably by text filters.

What is your text format configuration? Perhaps we need to adjust one of the filters to also remove the contents of style tags (and probably script tags as well).