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conformance · v131

v131 · css-anchor-positioning-allow-anchor-size-in-inset-and-margin-properties — conformance probe

8 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn chromestatus: #5203950077476864 generated 2026-06-05T23:04:00Z by manual-codex-devtools-mcp
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pass
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id contract kind verdict detail
anchor-size-in-top-inset anchor-size() is accepted as a value in the top inset property. spec ↗ css-supports
anchor-size-in-left-inset anchor-size() is accepted as a value in the left inset property. css-supports
anchor-size-in-margin-top anchor-size() is accepted in margin-top. css-supports
anchor-size-in-margin-shorthand anchor-size() is accepted inside the margin shorthand. css-supports
anchor-size-in-width-still-supported The pre-existing case of anchor-size() in sizing properties still works. css-supports
anchor-size-calc-in-inset anchor-size() composes inside calc() in an inset property. css-supports
anchor-size-calc-in-margin-left anchor-size() composes inside calc() in a margin-side property. spec ↗ css-supports
anchor-size-in-max-width anchor-size() is still accepted in max-width while the same component uses it in margins. css-supports