WPT
wpt / css / css-properties-values-api / unit-cycles.html
Spec: CSS Properties and Values API ↗
Runs: Chrome 155.0.8039.0 (wpt@a4fcd77aa, 2026-09-03) | Firefox 157.0a1 (wpt@cc4d45aa0, 2026-09-03) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-a9df8 (wpt@9b4cabf6d, 2026-09-03) | Servo Servo 0.6 (wpt@7e3d005d7, 2026-09-03) | Blitz 188486089 (wpt@a95401e4e, 2026-09-02)
View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi
| Chrome | Firefox | Safari | Ladybird | Servo | Blitz | |
|---|---|---|---|---|---|---|
| Total | 27/27 | 24/27 | 27/27 | 10/27 | 27/27 | 0/27 |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| Font-dependent unregistered variables can be used in font-size | PASS | FAIL | PASS | PASS | PASS | — |
| Registered universal variables referencing font-dependent units can be used in font-size | PASS | PASS | PASS | PASS | PASS | — |
| Font-dependent unregistered variables referencing env() can be used in font-size | PASS | FAIL | PASS | PASS | PASS | — |
| Non-font-dependent variables can be used in font-size | PASS | PASS | PASS | PASS | PASS | — |
| Lengths with em units may not be referenced from font-size | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with ex units may not be referenced from font-size | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with ch units may not be referenced from font-size | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with lh units may not be referenced from font-size | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with rem units may be referenced from font-size on non-root element | PASS | PASS | PASS | PASS | PASS | — |
| Lengths with rem units may not be referenced from font-size on root element | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with lh units may not be referenced from line-height | PASS | PASS | PASS | FAIL | PASS | — |
| Fallback may not use font-relative units | PASS | PASS | PASS | FAIL | PASS | — |
| Fallback may not use line-height-relative units | PASS | PASS | PASS | FAIL | PASS | — |
| Fallback not triggered while inside em unit cycle | PASS | PASS | PASS | FAIL | PASS | — |
| Fallback not triggered while inside ex unit cycle | PASS | PASS | PASS | FAIL | PASS | — |
| Fallback not triggered while inside ch unit cycle | PASS | PASS | PASS | PASS | PASS | — |
| Fallback not triggered while inside rem unit cycle on root element | PASS | PASS | PASS | FAIL | PASS | — |
| Fallback not triggered while inside lh unit cycle | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with em units are detected via var references | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with ex units are detected via var references | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with ch units are detected via var references | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with rem units are detected via var references | PASS | PASS | PASS | FAIL | PASS | — |
| Lengths with lh units are detected via var references | PASS | PASS | PASS | FAIL | PASS | — |
| Inherited lengths with em units may be used | PASS | PASS | PASS | PASS | PASS | — |
| Inherited lengths with ex units may be used | PASS | PASS | PASS | PASS | PASS | — |
| Inherited lengths with ch units may be used | PASS | FAIL | PASS | PASS | PASS | — |
| Inherited lengths with lh units may be used | PASS | PASS | PASS | PASS | PASS | — |
| Uncaught JS error | — | — | — | — | — | FAIL |