[wp-trac] [WordPress Trac] #42988: HTML Code Checking Feature (V4.9) Has Bugs

[WordPress Trac]

#42988: HTML Code Checking Feature (V4.9) Has Bugs
-------------------------------+------------------------------
 Reporter:  akaim              |       Owner:
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Widgets            |     Version:  4.9.1
 Severity:  major              |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:
-------------------------------+------------------------------
Changes (by kravic):

 * keywords:  needs-screenshots => reporter-feedback
 * component:  General => Widgets
 * severity:  normal => major


Comment:

 Hi everyone,

 I can confirm that Custom HTML widget has serious bug after introducing
 HTML check option.
 After updating from 4.8 to 4.9.1 on one of the many sites I manage, I lost
 all Custom HTML widgets.

 Strange thing is that <iframe> tag works, but simple <img> and <p> portion
 of HTML breaks everything.

 For example, I created two Custom HTML widgets, first is a Facebook page
 <iframe> and second simple image banner with one paragraph of text below.
 When I saved second widget I had no errors, switched to Menus and switched
 back to Widgets, just to find out that both Custom HTML widgets
 disappeared.

 I also tried with Text widget, Visual tab nicely displays the banner and
 the text, but after I saved it, that widget has gone forever.

 DevTools console doesn't show any errors.

 Code example for Custom HTML widget:

 {{{
 <img alt="banner" src="http://www.example.com/wp-
 content/uploads/2018/01/banner.png">
 <p>text</p>
 }}}

--
Ticket URL: <https://core.trac.wordpress.org/ticket/42988#comment:2>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform