[wp-trac] [WordPress Trac] #64598: Block Supports: Define CSS vars for blocks based on feature selectors

[WordPress Trac]

#64598: Block Supports: Define CSS vars for blocks based on feature selectors
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 Reporter:  aaronrobertshaw  |      Owner:  (none)
     Type:  enhancement      |     Status:  new
 Priority:  normal           |  Milestone:  7.0
Component:  Editor           |    Version:  trunk
 Severity:  normal           |   Keywords:  gutenberg-merge
  Focuses:                   |
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 This ticket tracks the backport of PHP files for the following Gutenberg
 update:

 https://github.com/WordPress/gutenberg/pull/75226

 These updates add support for generating preset CSS custom properties
 (vars) on feature-specific selectors rather than only a block's root
 selector.

 Some blocks define their root selector as an inner element (e.g. the
 Button block uses `.wp-block-button .wp-block-button__link`). Preset CSS
 vars (like dimension sizes) need to be applied on the outer block wrapper
 instead. This change enables that by allowing blocks to define feature-
 level selectors that are used when outputting preset CSS variables.

 This is required for the Button block's adoption of width block support.
 See https://github.com/WordPress/gutenberg/pull/74242 for further context.

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Ticket URL: <https://core.trac.wordpress.org/ticket/64598>
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