[wp-trac] [WordPress Trac] #55602: theme.json custom variables with letter and number next to eachother gets converted to letter {dash} number in the css vars HTML output

[WordPress Trac]

#55602: theme.json custom variables with letter and number next to eachother gets
converted to letter {dash} number in the css vars HTML output
------------------------------+-----------------------------
 Reporter:  cbaldelomar       |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Awaiting Review
Component:  General           |    Version:  5.9.3
 Severity:  normal            |   Keywords:
  Focuses:  coding-standards  |
------------------------------+-----------------------------
 In theme.json file, version 2, the following custom entry

 {{{"heading-font-size-h1": "var(--cp-vars-heading-font-size-h1)",}}}

 renders in an HTML document:

 {{{--wp--custom--heading-font-size-h-1: var(--cp-vars-heading-font-
 size-h1);}}}

 This use to not be the case, and was a breaking change for plugins and
 themes that use `h1` in their CSS vars instead of the changed `h-1`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/55602>
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