fix(css): clarify unitless zero for angle values#44147
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hamishwillee merged 2 commits intoMay 17, 2026
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Thanks very much @danyalahmed1995 - confirmed via spec https://drafts.csswg.org/css-values/#angles
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Summary
Fixes #44143.
Updates the CSS
<angle>value documentation to clarify that a unitless0is not generally valid for angle values.The previous wording said:
That was too broad. Some legacy angle contexts may allow a unitless zero, but
<angle>values should generally include an angle unit such as0deg,0grad,0rad, or0turn.This PR also updates the null angle example so it no longer lists bare
0as equivalent to angle values.Changes
<angle>syntax note for zero angles.0from the null angle equivalence example.Validation
npm run filecheck -- files/en-us/web/css/reference/values/angle/index.mdnpx markdownlint-cli2 files/en-us/web/css/reference/values/angle/index.mdnpx prettier -c files/en-us/web/css/reference/values/angle/index.mdnpx cspell --no-progress --gitignore --config .vscode/cspell.json files/en-us/web/css/reference/values/angle/index.mdgit diff --check