WPT
wpt / custom-elements / microtasks-and-constructors.html
Spec: https://html.spec.whatwg.org/multipage/custom-elements.html ↗
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@47d833bbc, 2026-09-03) | Servo Servo 0.6 (wpt@09159dcb3, 2026-09-02) | 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 | 5/5 | 5/5 | 5/5 | 5/5 | 5/5 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| Microtasks evaluate immediately when the stack is empty inside the parser | PASS | PASS | PASS | PASS | PASS | — |
| Microtasks evaluate immediately when the stack is empty inside the parser, causing the checks on no attributes to fail | PASS | PASS | PASS | PASS | PASS | — |
| Microtasks evaluate afterward when the stack is not empty using createElement() | PASS | PASS | PASS | PASS | PASS | — |
| Microtasks evaluate afterward when the stack is not empty using the constructor | PASS | PASS | PASS | PASS | PASS | — |
| Microtasks evaluate afterward when the stack is not empty due to upgrades | PASS | PASS | PASS | PASS | PASS | — |