WPT
wpt / fetch / api / headers / headers-basic.any.html
Spec: Fetch ↗
Runs: Chrome 155.0.8039.0 (wpt@ffab1bde3, 2026-09-03) | Firefox 157.0a1 (wpt@ffab1bde3, 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 | 23/23 | 23/23 | 23/23 | 23/23 | 23/23 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| Create headers from no parameter | PASS | PASS | PASS | PASS | PASS | — |
| Create headers from undefined parameter | PASS | PASS | PASS | PASS | PASS | — |
| Create headers from empty object | PASS | PASS | PASS | PASS | PASS | — |
| Create headers with null should throw | PASS | PASS | PASS | PASS | PASS | — |
| Create headers with 1 should throw | PASS | PASS | PASS | PASS | PASS | — |
| Create headers with sequence | PASS | PASS | PASS | PASS | PASS | — |
| Create headers with record | PASS | PASS | PASS | PASS | PASS | — |
| Create headers with existing headers | PASS | PASS | PASS | PASS | PASS | — |
| Create headers with existing headers with custom iterator | PASS | PASS | PASS | PASS | PASS | — |
| Check append method | PASS | PASS | PASS | PASS | PASS | — |
| Check set method | PASS | PASS | PASS | PASS | PASS | — |
| Check has method | PASS | PASS | PASS | PASS | PASS | — |
| Check delete method | PASS | PASS | PASS | PASS | PASS | — |
| Check get method | PASS | PASS | PASS | PASS | PASS | — |
| Check keys method | PASS | PASS | PASS | PASS | PASS | — |
| Check values method | PASS | PASS | PASS | PASS | PASS | — |
| Check entries method | PASS | PASS | PASS | PASS | PASS | — |
| Check Symbol.iterator method | PASS | PASS | PASS | PASS | PASS | — |
| Check forEach method | PASS | PASS | PASS | PASS | PASS | — |
| Iteration skips elements removed while iterating | PASS | PASS | PASS | PASS | PASS | — |
| Removing elements already iterated over causes an element to be skipped during iteration | PASS | PASS | PASS | PASS | PASS | — |
| Appending a value pair during iteration causes it to be reached during iteration | PASS | PASS | PASS | PASS | PASS | — |
| Prepending a value pair before the current element position causes it to be skipped during iteration and adds the current element a second time | PASS | PASS | PASS | PASS | PASS | — |