WPT
wpt / layout-instability / idlharness.html
Spec: Layout Instability API ↗
Runs: Chrome 155.0.8039.0 (wpt@752608e1a, 2026-09-03) | Firefox 157.0a1 (wpt@752608e1a, 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 a50cb8971 (wpt@a95401e4e, 2026-09-03)
View on the Blitz WPT dashboard | Open test on wpt.live | wpt.fyi
| Chrome | Firefox | Safari | Ladybird | Servo | Blitz | |
|---|---|---|---|---|---|---|
| Total | 35/35 | 2/35 | 2/35 | 2/35 | 2/35 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| idl_test setup | PASS | PASS | PASS | PASS | PASS | — |
| idl_test validation | PASS | PASS | PASS | PASS | PASS | — |
| LayoutShift interface: existence and properties of interface object | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface object length | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface object name | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: existence and properties of interface prototype object | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: existence and properties of interface prototype object's "constructor" property | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: existence and properties of interface prototype object's @@unscopables property | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: attribute value | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: attribute hadRecentInput | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: attribute lastInputTime | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: attribute sources | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: operation toJSON() | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift must be primary interface of layoutShift | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Stringification of layoutShift | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: layoutShift must inherit property "value" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: layoutShift must inherit property "hadRecentInput" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: layoutShift must inherit property "lastInputTime" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: layoutShift must inherit property "sources" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: layoutShift must inherit property "toJSON()" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShift interface: default toJSON operation on layoutShift | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: existence and properties of interface object | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface object length | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface object name | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: existence and properties of interface prototype object | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: existence and properties of interface prototype object's "constructor" property | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: existence and properties of interface prototype object's @@unscopables property | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: attribute node | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: attribute previousRect | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: attribute currentRect | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution must be primary interface of layoutShiftAttribution | PASS | FAIL | FAIL | FAIL | FAIL | — |
| Stringification of layoutShiftAttribution | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: layoutShiftAttribution must inherit property "node" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: layoutShiftAttribution must inherit property "previousRect" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |
| LayoutShiftAttribution interface: layoutShiftAttribution must inherit property "currentRect" with the proper type | PASS | FAIL | FAIL | FAIL | FAIL | — |