[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:  6.0
Component:  Formatting                  |     Version:
 Severity:  normal                      |  Resolution:
 Keywords:  has-patch needs-unit-tests  |     Focuses:
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Comment (by peterwilsoncc):

 I'll resolve this ticket with the documentation fix in
 [attachment:"55407.diff"].

 As browsers treat HTML tags and attributes without case sensitivity, KSES
 needs to as well to match the behavior.

 The affect of this is KSES does need to be a little stricter with
 developers when adding elements to the array of supported values. This
 requires the values all be in lowercase.

 I did consider whether it could be resolved by code to allow both
 uppercase and lowercase elements in the allow list, but it would have a
 performance hit looping through the array each time and would cause
 problems for developers wishing to remove elements from the allow list.
 Removing `div` would also require removing `DIV`, `Div`, `DIv`, and the
 other possible combinations.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55407#comment:4>
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