[wp-trac] [WordPress Trac] #55407: Allow case-insensitive elements for KSES

[WordPress Trac]

#55407: Allow case-insensitive elements for KSES
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 Reporter:  r-a-y         |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Formatting    |    Version:
 Severity:  normal        |   Keywords:  has-patch
  Focuses:                |
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 I'm trying to allow some HTML elements that are capitalized.

 eg. `<Post attribute="value"></Post>`

 However, attempting to add a custom element with the
 `'wp_kses_allowed_html'` filter fails due to the `strtolower()` additions
 in `kses.php`. I've attached a patch, which removes these `strtolower()`
 calls. Let me know what you think.

 HTML elements do not have to be lowercase. The W3C notes this here:
 https://w3c.github.io/html-reference/documents.html#case-insensitivity

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Ticket URL: <https://core.trac.wordpress.org/ticket/55407>
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