[wp-trac] [WordPress Trac] #40680: Add support for `'tag' => true` in `wp_kses_attr()`

[WordPress Trac]

#40680: Add support for `'tag' => true` in `wp_kses_attr()`
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 Reporter:  ocean90      |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Future Release
Component:  Security     |    Version:
 Severity:  normal       |   Keywords:  has-patch has-unit-tests commit
  Focuses:               |
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 Related: [meta5483], #20017

 `wp_kses_attr()` uses `$allowed_html[strtolower($element)]) == 0` to check
 whether any attributes are allowed for an element. There's at least
 [https://core.trac.wordpress.org/browser/tags/4.7.4/src/wp-admin/includes
 /class-automatic-upgrader-skin.php?marks=89-91#L84 one place] where `true`
 is used to define the support of '''no''' attributes. But because `count(
 true )` returns 1 unnecessary checks for the support of attributes are
 performed.

 I don't see anything wrong with using `true` as an alternative for an
 empty array and because it's already supported for attributes (#20017) I
 suggest to add official support for `true` in `wp_kses_attr()` as well.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40680>
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