WPT

This page compares scores on the Web Platform Tests across web engines, using the latest master runs from wpt.fyi and Blitz's own test runner.

wpt / css / selectors / invalidation

Spec: Selectors ↗

Runs: Chrome 158.0.8110.0 (wpt@850b36a56, 2026-10-18) | Firefox 160.0a1 (wpt@b58866519, 2026-10-18) | Safari 254 preview (wpt@850b36a56, 2026-10-18) | Ladybird 1.0-e7b21 (wpt@850b36a56, 2026-10-18) | Servo Servo 0.7 (wpt@df642c414, 2026-10-17) | Blitz fb8d6c15e (wpt@cd1d8aa5b, 2026-10-17)

Score history

Percentage of subtests passing over time, one master run per day. Every engine's percentage is relative to the same denominator: the total number of subtests known to any engine in the latest runs (so lines are not distorted by tests being added to WPT, and an engine that skips tests is not flattered for it).

1 month 3 months 6 months 1 year 2 years 4 years All time

Sort: alphabetical | by subtest count

Area	Chrome	Firefox	Safari	Ladybird	Servo	Blitz
Total	98.2%3003/3056	96.9%2963/3056	99.1%3031/3056	99.4%3040/3056	49.5%1515/3056	46.4%1419/3056
crashtests	100.0%2/2	100.0%2/2	100.0%2/2	100.0%2/2	100.0%2/2	100.0%2/2

Test	Chrome	Firefox	Safari	Ladybird	Servo	Blitz
Total	98.2%3001/3054	96.9%2961/3054	99.1%3029/3054	99.4%3038/3054	49.5%1513/3054	46.3%1417/3054
any-link-attribute-removal.html	PASS	PASS	PASS	PASS	PASS	PASS
any-link-pseudo.html	PASS	PASS	PASS	PASS	PASS	PASS
attribute-or-elemental-selectors-in-has.html	31/31	31/31	31/31	31/31	18/31	9/31
attribute.html	6/6	6/6	6/6	6/6	6/6	6/6
child-indexed-pseudo-classes-in-has.html	66/66	66/66	66/66	66/66	39/66	39/66
class-id-attr.html	PASS	PASS	PASS	PASS	PASS	PASS
defined-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
defined.html	PASS	PASS	PASS	PASS	PASS	FAIL
dir-pseudo-class-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
empty-pseudo-in-has-display-none.html	14/14	14/14	14/14	14/14	7/14	7/14
empty-pseudo-in-has.html	6/6	6/6	6/6	6/6	1/6	1/6
enabled-disabled.html	2/2	2/2	2/2	2/2	2/2	2/2
first-child-last-child.html	2/2	2/2	2/2	2/2	2/2	0/2
fullscreen-pseudo-class-in-has.html	2/2	2/2	2/2	2/2	0/2	0/2
has-append-first-node.html	PASS	PASS	PASS	PASS	FAIL	FAIL
has-complexity.html	7/7	7/7	7/7	7/7	1/7	1/7
has-css-nesting-shared.html	12/12	12/12	12/12	12/12	6/12	6/12
has-in-adjacent-position.html	295/295	295/295	295/295	295/295	193/295	193/295
has-in-ancestor-position.html	337/337	337/337	337/337	337/337	210/337	210/337
has-in-is-non-subject-compound.html	3/3	3/3	3/3	3/3	2/3	2/3
has-in-parent-position.html	211/211	211/211	211/211	211/211	152/211	152/211
has-in-sibling-position.html	295/295	295/295	295/295	295/295	181/295	181/295
has-invalidation-after-removing-non-first-element.html	2/2	2/2	2/2	2/2	1/2	1/2
has-invalidation-first-in-sibling-chain.html	12/12	12/12	8/12	12/12	8/12	8/12
has-invalidation-for-wiping-an-element.html	5/5	5/5	5/5	5/5	3/5	2/5
has-nested-pseudo-001-crash.html	PASS	PASS	PASS	PASS	PASS	PASS
has-nested-pseudo-002-crash.html	PASS	PASS	PASS	PASS	PASS	PASS
has-nested-pseudo-003-crash.html	PASS	PASS	PASS	PASS	PASS	PASS
has-pseudo-element-subject-child-mutation.html	4/4	4/4	4/4	4/4	1/4	0/4
has-pseudo-element.html	PASS	PASS	PASS	PASS	FAIL	FAIL
has-pseudoclass-only.html	36/36	36/36	36/36	36/36	24/36	24/36
has-sibling-insertion-removal.html	28/28	28/28	28/28	28/28	14/28	14/28
has-sibling-propagation.html	PASS	PASS	PASS	PASS	PASS	PASS
has-sibling.html	71/71	71/71	71/71	71/71	36/71	36/71
has-side-effect.html	3/3	3/3	3/3	3/3	2/3	2/3
has-unstyled.html	9/9	9/9	9/9	9/9	5/9	5/9
has-with-is-child-combinator.html	10/10	10/10	10/10	10/10	7/10	7/10
has-with-nesting-parent-containing-complex.html	37/37	37/37	37/37	37/37	19/37	19/37
has-with-nesting-parent-containing-hover.html	PASS	PASS	PASS	PASS	FAIL	SKIP
has-with-not.html	21/21	21/21	21/21	21/21	11/21	11/21
has-with-nth-child-sibling-remove.html	PASS	PASS	PASS	PASS	FAIL	FAIL
has-with-nth-child.html	5/5	5/5	1/5	5/5	4/5	4/5
has-with-pseudo-class.html	41/41	41/41	41/41	41/41	0/41	0/41
heading-pseudo-class-in-has-with-headingoffset.html	33/56	33/56	56/56	56/56	33/56	33/56
heading-pseudo-class-in-has-with-slot-reassignment.html	26/39	26/39	39/39	39/39	26/39	0/39
heading-pseudo-class-in-has.html	55/72	55/72	72/72	72/72	55/72	29/72
host-context-pseudo-class-in-has.html	6/6	4/6	4/6	4/6	4/6	0/6
host-has-shadow-tree-element-at-nonsubject-position.html	26/26	10/26	25/26	25/26	10/26	0/26
host-has-shadow-tree-element-at-subject-position.html	26/26	10/26	25/26	25/26	10/26	1/26
host-pseudo-class-in-has.html	4/4	4/4	4/4	4/4	2/4	0/4
input-in-range-in-has-with-readonly.html	4/4	4/4	4/4	0/4	0/4	0/4
input-pseudo-classes-in-has.html	10/10	10/10	10/10	9/10	0/10	0/10
insert-sibling-001.html	PASS	PASS	PASS	PASS	PASS	FAIL
insert-sibling-002.html	PASS	PASS	PASS	PASS	FAIL	FAIL
insert-sibling-003.html	PASS	PASS	PASS	PASS	FAIL	FAIL
insert-sibling-004.html	PASS	PASS	PASS	PASS	FAIL	FAIL
is-pseudo-containing-complex-in-has.html	476/476	476/476	476/476	476/476	140/476	140/476
is-pseudo-containing-sibling-relationship-in-has.html	21/21	21/21	12/21	21/21	20/21	20/21
is-where-pseudo-containing-hard-pseudo-and-never-matching.html	12/12	12/12	12/12	12/12	8/12	8/12
is-where-pseudo-containing-hard-pseudo.html	20/20	20/20	20/20	20/20	20/20	20/20
is.html	7/7	7/7	7/7	7/7	7/7	7/7
lang-pseudo-class-in-has-document-element.html	PASS	PASS	PASS	PASS	FAIL	FAIL
lang-pseudo-class-in-has-multiple-document-elements.html	PASS	PASS	PASS	PASS	TIMEOUT	FAIL
lang-pseudo-class-in-has-xhtml.xhtml	PASS	PASS	PASS	PASS	FAIL	FAIL
lang-pseudo-class-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
link-pseudo-class-in-has.html	2/2	2/2	2/2	2/2	0/2	0/2
link-pseudo-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
location-pseudo-classes-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
media-loading-pseudo-classes-in-has.sub.html	2/2	2/2	2/2	0/2	0/2	0/2
media-pseudo-classes-in-has.html	3/3	3/3	3/3	3/3	0/3	0/3
modal-pseudo-class-in-has.html	5/5	5/5	5/5	3/5	1/5	0/5
negated-always-matches-negated-first-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-always-matches-negated-last-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-first-of-type-in-nonsubject-position.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-has-in-nonsubject-position.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-is-always-matches-negated-first-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-is-always-matches-negated-last-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-is-never-matches-negated-first-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-is-never-matches-negated-last-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-last-of-type-invalidation.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-negated-first-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-negated-last-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-never-matches-negated-first-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-never-matches-negated-last-of-type-when-ancestor-changes.html	PASS	PASS	PASS	PASS	PASS	PASS
negated-nth-child-when-ancestor-changes.html	PASS	PASS	PASS	PASS	FAIL	FAIL
negated-nth-last-child-when-ancestor-changes.html	PASS	PASS	PASS	PASS	FAIL	FAIL
not-001.html	2/2	2/2	2/2	2/2	2/2	2/2
not-002.html	6/6	6/6	6/6	6/6	6/6	6/6
not-pseudo-containing-complex-in-has.html	460/460	460/460	460/460	460/460	115/460	115/460
not-pseudo-containing-sibling-relationship-in-has.html	3/3	3/3	1/3	3/3	2/3	2/3
nth-child-containing-ancestor.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-in-shadow-root.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-attr-largedom.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-attr.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-class-prefix.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-class.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-id-prefix.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-ids.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-in-ancestor.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-in-is.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-in-shadow-root.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-is.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-pseudo-class.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-of-sibling.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-when-ancestor-changes.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-when-sibling-changes.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-child-whole-subtree.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-containing-ancestor.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-in-shadow-root.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-attr.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-class-prefix.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-class.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-id-prefix.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-ids.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-in-ancestor.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-in-is.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-in-shadow-root.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-is.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-pseudo-class.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-of-sibling.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-when-ancestor-changes.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-last-child-when-sibling-changes.html	PASS	PASS	PASS	PASS	FAIL	FAIL
nth-of-namespace-class-invalidation-crash.html	PASS	PASS	PASS	PASS	PASS	PASS
open-pseudo-class-in-has.html	9/9	9/9	8/9	9/9	0/9	0/9
option-disabled-when-ancestor-changes.html	4/4	0/4	4/4	2/4	0/4	0/4
part-dir.html	2/2	2/2	2/2	2/2	0/2	0/2
part-lang.html	2/2	0/2	2/2	2/2	0/2	0/2
part-pseudo.html	PASS	PASS	PASS	PASS	PASS	FAIL
placeholder-shown.html	4/4	4/4	4/4	4/4	3/4	2/4
quirks-mode-stylesheet-dynamic-add-001.html	PASS	PASS	PASS	PASS	PASS	FAIL
selectorText-dynamic-001.html	PASS	PASS	PASS	PASS	PASS	PASS
sheet-going-away-001.html	PASS	PASS	PASS	PASS	PASS	PASS
sheet-going-away-002.html	PASS	PASS	PASS	PASS	PASS	PASS
sibling.html	7/7	7/7	7/7	7/7	7/7	7/7
state-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
subject-has-invalidation-with-display-none-anchor-element.html	PASS	PASS	PASS	PASS	FAIL	FAIL
target-pseudo-in-has.html	PASS	PASS	PASS	PASS	FAIL	FAIL
typed-child-indexed-pseudo-classes-in-has.html	102/102	102/102	102/102	102/102	54/102	54/102
user-action-pseudo-classes-in-has.html	PASS	PASS	FAIL	FAIL	FAIL	SKIP
user-valid-user-invalid.html	PASS	PASS	PASS	PASS	FAIL	SKIP
where.html	5/5	5/5	5/5	5/5	5/5	5/5