[wp-trac] [WordPress Trac] #63712: Switching between Visual and Code editor in the Classic Editor (TinyMCE) generates new HTML elements

[WordPress Trac]

#63712: Switching between Visual and Code editor in the Classic Editor (TinyMCE)
generates new HTML elements
---------------------------+------------------------------
 Reporter:  goce.mitevski  |       Owner:  (none)
     Type:  defect (bug)   |      Status:  closed
 Priority:  normal         |   Milestone:  Awaiting Review
Component:  TinyMCE        |     Version:  6.8.2
 Severity:  normal         |  Resolution:  invalid
 Keywords:  close          |     Focuses:  administration
---------------------------+------------------------------
Changes (by goce.mitevski):

 * keywords:  needs-test-info => close
 * status:  new => closed
 * resolution:   => invalid


Comment:

 Thanks @krupajnanda!

 I did some additional digging and it seems that the problem is not in core
 WP but in the Harper extension for Firefox. I was using a version from
 this tree: https://github.com/Automattic/harper/tree/v0.51.0. Once I
 disabled the extension this additional content stopped being appended to
 the posts when switching between the editors.

 I tried it in a fresh new WP install of 6.8.2 with only one additional
 plugin installed and activated - Classic Editor.

 Though I was able to recreate what @vishalmori showed in his example, I
 think that's an entirely different issue.

 Closing this ticket as invalid for WordPress core.

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Ticket URL: <https://core.trac.wordpress.org/ticket/63712#comment:3>
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