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Status

This page documents the implementation status of various HTML and CSS features in Blitz.

CSS PropertiesHTML ElementsEventsWPT Tests

This page documents Blitz's scores on the "css" subsuite of the Web Platform Tests.

Note: As it does not have a JavaScript engine, Blitz can only run about 20% of the total subtests. In the numbers below, tests that Blitz can't run are ignored and percentages are relative to the number of tests run.

Data from commit:
708eb61 WPT runner: support mismatch reftests and multiple rel=match links (#665) (2026-08-09)

wpt / css / selectors / invalidation

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total9.50%(6/63)9.52%(6/63)9.52%
TestSubtestsSubtest %Status
any-link-attribute-removal.html(0/1)0.00%FAIL
class-id-attr.html(0/1)0.00%FAIL
dir-pseudo-class-in-has.html(0/1)0.00%FAIL
has-append-first-node.html(0/1)0.00%FAIL
has-nested-pseudo-001-crash.html(1/1)100.00%PASS
has-nested-pseudo-002-crash.html(1/1)100.00%PASS
has-nested-pseudo-003-crash.html(1/1)100.00%PASS
has-pseudo-element.html(0/1)0.00%FAIL
has-with-nth-child-sibling-remove.html(0/1)0.00%FAIL
lang-pseudo-class-in-has-document-element.html(0/1)0.00%FAIL
lang-pseudo-class-in-has-multiple-document-elements.html(0/1)0.00%FAIL
lang-pseudo-class-in-has-xhtml.xhtml(0/1)0.00%FAIL
lang-pseudo-class-in-has.html(0/1)0.00%FAIL
negated-always-matches-negated-first-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-always-matches-negated-last-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-first-of-type-in-nonsubject-position.html(0/1)0.00%FAIL
negated-has-in-nonsubject-position.html(1/1)100.00%PASS
negated-is-always-matches-negated-first-of-type-when-ancestor-changes.html(1/1)100.00%PASS
negated-is-always-matches-negated-last-of-type-when-ancestor-changes.html(1/1)100.00%PASS
negated-is-never-matches-negated-first-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-is-never-matches-negated-last-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-last-of-type-invalidation.html(0/1)0.00%FAIL
negated-negated-first-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-negated-last-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-never-matches-negated-first-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-never-matches-negated-last-of-type-when-ancestor-changes.html(0/1)0.00%FAIL
negated-nth-child-when-ancestor-changes.html(0/1)0.00%FAIL
negated-nth-last-child-when-ancestor-changes.html(0/1)0.00%FAIL
nth-child-containing-ancestor.html(0/1)0.00%FAIL
nth-child-in-shadow-root.html(0/1)0.00%FAIL
nth-child-of-attr-largedom.html(0/1)0.00%FAIL
nth-child-of-attr.html(0/1)0.00%FAIL
nth-child-of-class-prefix.html(0/1)0.00%FAIL
nth-child-of-class.html(0/1)0.00%FAIL
nth-child-of-has.html(0/1)0.00%FAIL
nth-child-of-id-prefix.html(0/1)0.00%FAIL
nth-child-of-ids.html(0/1)0.00%FAIL
nth-child-of-in-ancestor.html(0/1)0.00%FAIL
nth-child-of-in-is.html(0/1)0.00%FAIL
nth-child-of-in-shadow-root.html(0/1)0.00%FAIL
nth-child-of-is.html(0/1)0.00%FAIL
nth-child-of-pseudo-class.html(0/1)0.00%FAIL
nth-child-of-sibling.html(0/1)0.00%FAIL
nth-child-when-ancestor-changes.html(0/1)0.00%FAIL
nth-child-when-sibling-changes.html(0/1)0.00%FAIL
nth-last-child-containing-ancestor.html(0/1)0.00%FAIL
nth-last-child-in-shadow-root.html(0/1)0.00%FAIL
nth-last-child-of-attr.html(0/1)0.00%FAIL
nth-last-child-of-class-prefix.html(0/1)0.00%FAIL
nth-last-child-of-class.html(0/1)0.00%FAIL
nth-last-child-of-has.html(0/1)0.00%FAIL
nth-last-child-of-id-prefix.html(0/1)0.00%FAIL
nth-last-child-of-ids.html(0/1)0.00%FAIL
nth-last-child-of-in-ancestor.html(0/1)0.00%FAIL
nth-last-child-of-in-is.html(0/1)0.00%FAIL
nth-last-child-of-in-shadow-root.html(0/1)0.00%FAIL
nth-last-child-of-is.html(0/1)0.00%FAIL
nth-last-child-of-pseudo-class.html(0/1)0.00%FAIL
nth-last-child-of-sibling.html(0/1)0.00%FAIL
nth-last-child-when-ancestor-changes.html(0/1)0.00%FAIL
nth-last-child-when-sibling-changes.html(0/1)0.00%FAIL
part-pseudo.html(0/1)0.00%FAIL
sheet-going-away-002.html(0/1)0.00%FAIL