[wp-trac] [WordPress Trac] #64418: Valid CSS is causing failure in the Additional CSS panel

WordPress Trac noreply at wordpress.org
Mon Jan 26 15:17:18 UTC 2026


#64418: Valid CSS is causing failure in the Additional CSS panel
-------------------------------------------------+-------------------------
 Reporter:  drw158                               |       Owner:  jonsurrell
     Type:  defect (bug)                         |      Status:  closed
 Priority:  normal                               |   Milestone:  7.0
Component:  Customize                            |     Version:  4.7
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests dev-        |     Focuses:  css
  feedback                                       |
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Changes (by jonsurrell):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 In [changeset:"61527" 61527]:
 {{{
 #!CommitTicketReference repository="" revision="61527"
 Customize: Allow arbitrary custom CSS.

 Update custom CSS validation to allow any CSS except `STYLE` close tags.
 Previously, some valid CSS would be rejected for containing HTML syntax
 characters, like this example:

 {{{
 @property --animate {
   syntax: "<custom-ident>"; /* <-- Validation error on `<` */
   inherits: true;
   initial-value: false;
 }
 }}}

 Developed in https://github.com/WordPress/wordpress-develop/pull/10667.

 Follow-up to [61418], [61486].

 Props jonsurrell, westonruter, peterwilsoncc, johnbillion, xknown,
 sabernhardt, dmsnell, soyebsalar01, dlh.
 Fixes #64418.
 }}}

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/64418#comment:55>
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