[wp-trac] [WordPress Trac] #64771: Existing block level custom CSS in a post breaks when the post is edited by user without unfiltered_html

[WordPress Trac]

#64771: Existing block level custom CSS in a post breaks when the post is edited by
user without unfiltered_html
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 Reporter:  glendaviesnz  |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  high          |   Milestone:  7.0
Component:  Editor        |     Version:  trunk
 Severity:  critical      |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by jorbin):

 This was discussed during an impromptu scrub.  Myself and @joedolson both
 are concerned about the idea of just adding a notice as it won't stop
 users from potentially breaking a page without the ability to unbreak it.

 This needs either a proper solution that won't lead to broken webpages or
 the per block css feature should be punted from 7.0.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64771#comment:42>
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