[wp-trac] [WordPress Trac] #34406: wp_kses_hair is too stringent redux

[WordPress Trac]

#34406: wp_kses_hair is too stringent redux
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 Reporter:  travisnorthcutt  |      Owner:
     Type:  defect (bug)     |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Formatting       |    Version:  1.5
 Severity:  normal           |   Keywords:
  Focuses:                   |
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 Attributes from custom xml name spaces may use numbers, underscores, en
 dashes, and em dashes, but the regex used inside `wp_kses_hair()` doesn't
 allow them through. Technically, there are other allowed characters, but
 that's probably getting into very fringe edge-case territory.

 Admittedly, en and em dashes may be edge-case territory as well, so two
 patches are provided: one allowing numbers and underscores, and one
 additionally allowing en and em dashes.

 Related: #17847

 [http://www.w3.org/TR/html-markup/syntax.html#attribute-name Here's a link
 to the W3C spec for reference.]

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Ticket URL: <https://core.trac.wordpress.org/ticket/34406>
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