[wp-trac] [WordPress Trac] #33179: Caption shortcode shouldn't output an invalid HTML ID

[WordPress Trac]

#33179: Caption shortcode shouldn't output an invalid HTML ID
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 Reporter:  helen         |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.3
Component:  Media         |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 While looking more closely at core shortcodes post-4.2.3, I noticed that
 the caption one escapes the provided ID and is safe, but that doesn't mean
 it's necessarily going to produce a valid HTML ID. We should also use
 `sanitize_html_class()`, since that's what it's for.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33179>
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