[wp-trac] [WordPress Trac] #27288: WP 3.9 Editor: 'mce_css' filter broken

[WordPress Trac]

#27288: WP 3.9 Editor: 'mce_css' filter broken
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 Reporter:  wpweaver      |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  3.9
Component:  Editor        |     Version:  trunk
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by nacin):

 Yeah, I can easily confirm that load-styles.php won't serve CSS to the
 admin without a text/css Content-Type header.

 I can do a post on make/core explaining the change, but this otherwise
 seems like a wontfix. I imagine the proper doctype has other benefits.

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Ticket URL: <https://core.trac.wordpress.org/ticket/27288#comment:13>
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