[wp-trac] [WordPress Trac] #44724: KSES: Allow 'download' attribute for links

[WordPress Trac]

#44724: KSES: Allow 'download' attribute for links
----------------------------+----------------------------------------
 Reporter:  SergeyBiryukov  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  5.0
Component:  Formatting      |    Version:
 Severity:  normal          |   Keywords:  needs-patch good-first-bug
  Focuses:                  |
----------------------------+----------------------------------------
 HTML5 introduced a [https://www.w3schools.com/TAgs/att_a_download.asp
 download] attribute for `<a>` tag. When a user with Author role tries to
 create a link with this attribute, it's stripped by KSES.

 Before saving:
 {{{
 <a href="/images/w3logo.jpg" download="w3logo">w3logo</a>
 }}}
 After saving:
 {{{
 <a href="/images/w3logo.jpg">w3logo</a>
 }}}

 At the moment, allowed attributes for `<a>` are: `href`, `rel`, `rev`,
 `name`, and `target`.

 `download` should be added as well.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44724>
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