WPT
wpt / html / semantics / sections / headingoffset-and-headingreset.html
Spec: HTML ↗
Runs: Chrome 155.0.8043.0 (wpt@b89af32bc, 2026-09-05) | Firefox 157.0a1 (wpt@b89af32bc, 2026-09-05) | Safari 251 preview (wpt@b89af32bc, 2026-09-05) | Ladybird 1.0-245ed (wpt@b89af32bc, 2026-09-06) | Servo Servo 0.6 (wpt@b89af32bc, 2026-09-06) | 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 | 0/61 | 0/61 | 61/61 | 61/61 | 0/61 | NOT RUN |
| Subtest | Chrome | Firefox | Safari | Ladybird | Servo | Blitz |
|---|---|---|---|---|---|---|
| headingoffset (set via attribute) should change the level a heading matches against | FAIL | FAIL | PASS | PASS | FAIL | — |
| headingoffset (set via attribute) should change the level when a parent changes offset | FAIL | FAIL | PASS | PASS | FAIL | — |
| headingoffset (set via property) should change the level a heading matches against | FAIL | FAIL | PASS | PASS | FAIL | — |
| headingoffset (set via property) should change the level when a parent changes offset | FAIL | FAIL | PASS | PASS | FAIL | — |
| headingoffset should not impact modals or explicit headingreset containers | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 1: heading level for <h1 data-expected-offset="2"><!-- Level 2, h1 + 1 = 2 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 2: heading level for <h2 data-expected-offset="3"><!-- Level 3, h2 + 1 = 3 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 3: heading level for <h3 data-expected-offset="4"><!-- Level 4, h3 + 1 = 4 --></h3> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 4: heading level for <h1 data-expected-offset="4"><!-- Level 4, h1 + 2 + 1 = 4 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 5: heading level for <h2 data-expected-offset="5"><!-- Level 5, h2 + 2 + 1 = 5 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 6: heading level for <h1 data-expected-offset="1"><!-- Level 1, h1 (headingreset)--></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 7: heading level for <h1 data-expected-offset="4"><!-- Level 4, h1 + 2 + 1 = 4 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 8: heading level for <h1 data-expected-offset="1" headingreset=""> <!-- Level 1, h1 (headingreset) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 9: heading level for <h1 data-expected-offset="9"><!-- Level 9, h1 + 8 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 10: heading level for <h2 data-expected-offset="9"><!-- Level 9, h2 + 8 (clamped) --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 11: heading level for <h3 data-expected-offset="9"><!-- Level 9, h3 + 8 (clamped) --></h3> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 12: heading level for <h4 data-expected-offset="9"><!-- Level 9, h4 + 8 (clamped) --></h4> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 13: heading level for <h5 data-expected-offset="9"><!-- Level 9, h5 + 8 (clamped) --></h5> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 14: heading level for <h6 data-expected-offset="9"><!-- Level 9, h6 + 8 (clamped) --></h6> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 15: heading level for <h1 data-expected-offset="1"><!-- Level 1, h1 (headingreset)--></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 16: heading level for <h1 data-expected-offset="9"><!-- Level 9, h1 + 8 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 17: heading level for <h1 data-expected-offset="1"><!-- Level 1, h1 + (-3 clamped to 0) --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 18: heading level for <h2 data-expected-offset="2"><!-- Level 2, h2 + (-3 clamped to 0) --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 19: heading level for <h3 data-expected-offset="3"><!-- Level 3, h3 + (-3 clamped to 0) --></h3> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 20: heading level for <h4 data-expected-offset="4"><!-- Level 4, h4 + (-3 clamped to 0) --></h4> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 21: heading level for <h5 data-expected-offset="5"><!-- Level 5, h5 + (-3 clamped to 0) --></h5> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 22: heading level for <h6 data-expected-offset="6"><!-- Level 6, h6 + (-3 clamped to 0) --></h6> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 23: heading level for <h1 data-expected-offset="1"><!-- Level 1, h1 (headingreset)--></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 24: heading level for <h1 data-expected-offset="1"><!-- Level 1, h1 + (-3 clamped to 0) --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 25: heading level for <h1 data-expected-offset="5"><!-- Level 5, h1 + 2 + 2 = 5 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 26: heading level for <h2 data-expected-offset="6"><!-- Level 6, h2 + 2 + 2 = 6 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 27: heading level for <h3 data-expected-offset="7"><!-- Level 7, h3 + 2 + 2 = 7 --></h3> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 28: heading level for <h4 data-expected-offset="8"><!-- Level 8, h4 + 2 + 2 = 8 --></h4> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 29: heading level for <h5 data-expected-offset="9"><!-- Level 9, h5 + 2 + 2 = 9 --></h5> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 30: heading level for <h6 data-expected-offset="9"> <!-- Level 9, h6 + 2 + 2 = (10 clamped to 9) --> </h6> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 31: heading level for <h1 data-expected-offset="3" headingoffset="2" headingreset=""> <!-- Level 3, h1 + 2 + (headingreset) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 32: heading level for <h2 data-expected-offset="4" headingoffset="2" headingreset=""> <!-- Level 4, h2 + 2 + (headingreset) --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 33: heading level for <h2 data-expected-offset="3"><!-- Level 3, h2 + 1 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 34: heading level for <h4 data-expected-offset="5"><!-- Level 5, h4 + 1 --></h4> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 35: heading level for <h4 data-expected-offset="4" headingreset=""> <!-- Level 4, h4 (headingreset) --> </h4> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 36: heading level for <h2 data-expected-offset="3"><!-- Level 3, h2 + 1 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 37: heading level for <h1 data-expected-offset="2" headingoffset="1"><!-- Level 2, h1 + 1 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 38: heading level for <h2 data-expected-offset="3" headingoffset="1"><!-- Level 3, h2 + 1 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 39: heading level for <h1 data-expected-offset="3" headingoffset="2"><!-- Level 3, h1 + 2--></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 40: heading level for <h2 data-expected-offset="4" headingoffset="2"><!-- Level 4, h2 + 2 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 41: heading level for <h1 data-expected-offset="2" headingoffset="1" headingreset=""> <!-- Level 2, h1 + 1 (headingreset) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 42: heading level for <h2 data-expected-offset="3" headingoffset="1" headingreset=""> <!-- Level 3, h2 + 1 (headingreset) --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 43: heading level for <h1 data-expected-offset="3" headingoffset="2" headingreset=""> <!-- Level 3, h1 + 2 (headingreset) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 44: heading level for <h2 data-expected-offset="4" headingoffset="2" headingreset=""> <!-- Level 4, h2 + 2 (headingreset) --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 45: heading level for <h1 data-expected-offset="9" headingoffset="20" headingreset=""> <!-- Level 9, h1 + 20 (clamped) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 46: heading level for <h2 data-expected-offset="9" headingoffset="20" headingreset=""> <!-- Level 9, h2 + 20 (clamped) --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 47: heading level for <h1 data-expected-offset="1" headingoffset="0" headingreset=""> <!-- Level 1, h1 + 0 --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 48: heading level for <h2 data-expected-offset="2" headingoffset="0" headingreset=""> <!-- Level 2, h2 + 0 --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 49: heading level for <h1 data-expected-offset="2" headingoffset="1"><!-- Level 2, h1 + 1 --></h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 50: heading level for <h2 data-expected-offset="3" headingoffset="1"><!-- Level 3, h2 + 1 --></h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 51: heading level for <h1 data-expected-offset="2" headingoffset="1" headingreset=""> <!-- Level 2, h1 + 1 --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 52: heading level for <h2 data-expected-offset="3" headingoffset="1" headingreset=""> <!-- Level 3, h2 + 1 --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 53: heading level for <h1 data-expected-offset="1" headingoffset="-1" headingreset=""> <!-- Level 1, h1 + (-1 clamped to 0) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 54: heading level for <h2 data-expected-offset="2" headingoffset="-1" headingreset=""> <!-- Level 2, h2 + (-1 clamped to 0) --> </h2> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 55: heading level for <h1 data-expected-offset="5"> <!-- Level 5, h1 + 1 + (-6 clamped to 0) + 3 + (-1 clamped to 0) --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |
| case 56: heading level for <h1 data-expected-offset="9" headingoffset="9" aria-level="3"> <!-- Level 3 --> </h1> should match based on expected document structure | FAIL | FAIL | PASS | PASS | FAIL | — |