← back to v148 · at-rule-css-feature-detection
conformance · v148
v148 · at-rule-css-feature-detection — conformance probe
5 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.
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pass
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fail
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blocked
5
total
| id | contract | kind | verdict | detail |
|---|---|---|---|---|
supports-at-rule-function |
CSS.supports parses the at-rule() condition function. spec ↗ | script | … | |
supports-at-rule-known |
at-rule(@font-face) reports support for a universally supported at-rule. spec ↗ | script | … | |
supports-at-rule-unknown-false |
at-rule(@definitely-not-an-at-rule) returns false rather than throwing. spec ↗ | script | … | |
supports-rule-at-rule-in-stylesheet |
@supports (at-rule(@container)) wraps rules conditionally. spec ↗ | script | … | |
supports-at-rule-descriptor |
at-rule() accepts a descriptor argument like at-rule(@font-face; font-display). spec ↗ | script | … |