Re: [csswg-drafts] [css-syntax] custom property names too permissive, require namespacing rules (#7129)

Re testcases, we've just patched this in and are seeing changes with some old tests:

[css/CSS2/i18n/syndata/character-encoding-001.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-001.xht)
[css/CSS2/i18n/syndata/character-encoding-004.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-004.xht)
[css/CSS2/i18n/syndata/character-encoding-007.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-007.xht)
[css/CSS2/i18n/syndata/character-encoding-010.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-010.xht)
[css/CSS2/i18n/syndata/character-encoding-026.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-026.xht)
[css/CSS2/i18n/syndata/character-encoding-027.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-027.xht)
[css/CSS2/i18n/syndata/character-encoding-028.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-028.xht)
[css/CSS2/i18n/syndata/character-encoding-029.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/i18n/syndata/character-encoding-029.xht)
[css/CSS2/syntax/characters-0080-009F-001.xht](https://github.com/web-platform-tests/wpt/blob/master/css/CSS2/syntax/characters-0080-009F-001.xht)

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Received on Friday, 22 April 2022 11:28:43 UTC