[wp-trac] [WordPress Trac] #34254: Bug when using the HTML Tag "<progress></progress>" (only when switching to Visual Editor)

[WordPress Trac]

#34254: Bug when using the HTML Tag "<progress></progress>" (only when switching to
Visual Editor)
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 Reporter:  Sprax2013     |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  4.3.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by swissspidy):

 The visual editor only allows for a limited set of HTML elements.
 `<progress>` is kinda unusual and probably not allowed by default in
 TinyMCE. This sounds reasonable to me, as the `<progress>` alone isn't
 very useful.

 You can hook into the `tiny_mce_before_init` filter to modify the
 `extended_valid_elements` setting.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34254#comment:1>
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