[wp-trac] [WordPress Trac] #55452: `safecss_filter_attr` removes background-images with URL parameters

[WordPress Trac]

#55452: `safecss_filter_attr` removes background-images with URL parameters
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 Reporter:  ryelle        |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Future Release
Component:  Formatting    |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:  css
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Comment (by webmandesign):

 This seems to be affecting Cover block with "Fixed background" enabled
 too.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55452#comment:2>
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