[wp-trac] [WordPress Trac] #48608: SVG tags with numbers in attributes filtered out by KSES despite being allowed

[WordPress Trac]

#48608: SVG tags with numbers in attributes filtered out by KSES despite being
allowed
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 Reporter:  johnpgreen    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 I have been able to successfully extend `$allowedposttags` using the
 `wp_kses_allowed_html` filter to allow a limited set of SVG tags but have
 encountered issues when attempting to use the `<linearGradient>` SVG
 element. This element is unique among the elements I have added in that it
 has attributes - specifically `x1`, `x2`, `y1`, and `y2` - that contain
 numbers.

 I believe I have narrowed down the culprit to the `wp_kses_hair` function,
 specifically that case 0 seems to only allow alpha characters.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48608>
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