[wp-trac] [WordPress Trac] #41874: Code Editor: Extend CSS linter to check for safecss-forbidden properties

[WordPress Trac]

#41874: Code Editor: Extend CSS linter to check for safecss-forbidden properties
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 Reporter:  westonruter  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  4.9
Component:  General      |    Version:
 Severity:  normal       |   Keywords:  needs-patch
  Focuses:               |
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 While there is a custom HTMLHint rule which checks for Kses violations,
 this does not extend to CSSLint and `safecss_filter_attr()`. It would be a
 nice enhancement to get illegal style properties flagged as lint errors as
 well.

 Originally https://github.com/WordPress/better-code-editing/issues/60:

 > The `safecss_filter_attr()` function is used by KSES to filter HTML
 `style` attributes, removing any properties that are illegal. This should
 be applied to CSS and `style` attributes in HTML, so that any illegal
 properties are flagged as such.
 >
 > It seems that HTMLHint is not currently applying CSSLint to `style`
 attributes, but if it did, then a `kses` rule added to CSSLint could then
 apply to both HTML and CSS.

 This is for the code editor introduced in [41376] for #12423.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41874>
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