Click here to download the Blitz Browser!

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:
1093b86 wpt: skip non-UTF-8 test files instead of crashing (#659) (2026-08-09)

wpt / css / css-shadow

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total7.10%(8/112)7.14%(8/112)7.14%
part0.00%(0/6)0.00%(0/6)0.00%
TestSubtestsSubtest %Status
css-scoping-shadow-assigned-node-with-before-after.html(0/1)0.00%FAIL
css-scoping-shadow-assigned-node-with-rules.html(0/1)0.00%FAIL
css-scoping-shadow-host-functional-rule.html(0/1)0.00%FAIL
css-scoping-shadow-host-namespace.html(0/1)0.00%FAIL
css-scoping-shadow-host-rule.html(0/1)0.00%FAIL
css-scoping-shadow-host-with-before-after.html(0/1)0.00%FAIL
css-scoping-shadow-invisible-slot.html(0/1)0.00%FAIL
css-scoping-shadow-nested-slot-display-override.html(0/1)0.00%FAIL
css-scoping-shadow-root-hides-children.html(0/1)0.00%FAIL
css-scoping-shadow-slot-display-override.html(0/1)0.00%FAIL
css-scoping-shadow-slot-fallback.html(0/1)0.00%FAIL
css-scoping-shadow-slot-style.html(0/1)0.00%FAIL
css-scoping-shadow-slot.html(0/1)0.00%FAIL
css-scoping-shadow-slotted-nested.html(0/1)0.00%FAIL
css-scoping-shadow-slotted-rule.html(0/1)0.00%FAIL
css-scoping-shadow-with-outside-rules.html(0/1)0.00%FAIL
css-scoping-shadow-with-rules-no-style-leak.html(1/1)100.00%PASS
css-scoping-shadow-with-rules.html(0/1)0.00%FAIL
has-slotted-001.html(0/1)0.00%FAIL
has-slotted-002.html(0/1)0.00%FAIL
has-slotted-003.html(0/1)0.00%FAIL
has-slotted-flattened-001.html(0/1)0.00%FAIL
has-slotted-flattened-002.html(0/1)0.00%FAIL
has-slotted-flattened-003.html(0/1)0.00%FAIL
has-slotted-flattened-004.html(0/1)0.00%FAIL
has-slotted-functional-001.tentative.html(0/1)0.00%FAIL
has-slotted-functional-002.tentative.html(0/1)0.00%FAIL
has-slotted-functional-003.tentative.html(0/1)0.00%FAIL
has-slotted-functional-004.tentative.html(0/1)0.00%FAIL
has-slotted-functional-005.tentative.html(0/1)0.00%FAIL
has-slotted-functional-006.tentative.html(0/1)0.00%FAIL
has-slotted-functional-007.tentative.html(0/1)0.00%FAIL
has-slotted-functional-flattened-001.tentative.html(0/1)0.00%FAIL
has-slotted-functional-flattened-002.tentative.html(0/1)0.00%FAIL
has-slotted-functional-flattened-003.tentative.html(0/1)0.00%FAIL
has-slotted-functional-flattened-004.tentative.html(0/1)0.00%FAIL
has-slotted-functional-flattened-005.tentative.html(0/1)0.00%FAIL
has-slotted-functional-flattened-006.tentative.html(0/1)0.00%FAIL
host-context-specificity-001.html(0/1)0.00%FAIL
host-context-specificity-002.html(0/1)0.00%FAIL
host-context-specificity-003.html(0/1)0.00%FAIL
host-defined.html(0/1)0.00%FAIL
host-descendant-001.html(0/1)0.00%FAIL
host-descendant-002.html(0/1)0.00%FAIL
host-descendant-003.html(0/1)0.00%FAIL
host-has-001.tentative.html(0/1)0.00%FAIL
host-has-002.tentative.html(0/1)0.00%FAIL
host-has-003.tentative.html(0/1)0.00%FAIL
host-has-internal-001.html(0/1)0.00%FAIL
host-has-internal-002.html(0/1)0.00%FAIL
host-has-internal-003.html(0/1)0.00%FAIL
host-has-internal-004.html(0/1)0.00%FAIL
host-is-001.html(0/1)0.00%FAIL
host-is-002.html(0/1)0.00%FAIL
host-is-003.html(0/1)0.00%FAIL
host-is-004.html(0/1)0.00%FAIL
host-is-005.html(0/1)0.00%FAIL
host-is-006.html(0/1)0.00%FAIL
host-multiple-001.html(0/1)0.00%FAIL
host-multiple-002.html(0/1)0.00%FAIL
host-multiple-003.html(0/1)0.00%FAIL
host-multiple-004.html(0/1)0.00%FAIL
host-multiple-005.html(0/1)0.00%FAIL
host-nested-001.html(0/1)0.00%FAIL
host-not-001.html(0/1)0.00%FAIL
host-slotted-001.html(0/1)0.00%FAIL
host-specificity-002.html(0/1)0.00%FAIL
host-specificity-003.html(0/1)0.00%FAIL
host-specificity.html(0/1)0.00%FAIL
host-with-default-namespace-001.html(0/1)0.00%FAIL
reslot-text-inheritance.html(0/1)0.00%FAIL
same-rules-bug-2044746-crash.html(1/1)100.00%PASS
same-rules-bug-2044746.html(0/1)0.00%FAIL
scoped-reference-animation-001.html(1/1)100.00%PASS
scoped-reference-animation-002.html(0/1)0.00%FAIL
shadow-assign-dynamic-001.html(0/1)0.00%FAIL
shadow-at-import.html(0/1)0.00%FAIL
shadow-directionality-001.tentative.html(0/1)0.00%FAIL
shadow-directionality-002.tentative.html(0/1)0.00%FAIL
shadow-disabled-sheet-001.html(0/1)0.00%FAIL
shadow-fallback-dynamic-001.html(0/1)0.00%FAIL
shadow-fallback-dynamic-002.html(0/1)0.00%FAIL
shadow-fallback-dynamic-003.html(0/1)0.00%FAIL
shadow-fallback-dynamic-004.html(1/1)100.00%PASS
shadow-fallback-dynamic-005.html(1/1)100.00%PASS
shadow-host-with-before-after.html(0/1)0.00%FAIL
shadow-link-rel-stylesheet-no-style-leak.html(0/1)0.00%FAIL
shadow-link-rel-stylesheet.html(0/1)0.00%FAIL
shadow-reassign-dynamic-001.html(0/1)0.00%FAIL
shadow-reassign-dynamic-002.html(0/1)0.00%FAIL
shadow-reassign-dynamic-004.html(0/1)0.00%FAIL
shadow-reassign-dynamic-006.html(1/1)100.00%PASS
shadow-root-insert-into-document.html(0/1)0.00%FAIL
slotted-details-content.html(0/1)0.00%FAIL
slotted-file-selector-button.html(1/1)100.00%PASS
slotted-has-001.html(0/1)0.00%FAIL
slotted-has-002.html(0/1)0.00%FAIL
slotted-has-003.html(0/1)0.00%FAIL
slotted-has-004.html(0/1)0.00%FAIL
slotted-placeholder.html(1/1)100.00%PASS
slotted-specificity-002.html(0/1)0.00%FAIL
slotted-specificity.html(0/1)0.00%FAIL
slotted-with-pseudo-element.html(0/1)0.00%FAIL
stylesheet-title-001.html(0/1)0.00%FAIL
svg-id-ref-001.html(0/1)0.00%FAIL
whitespace-crash-001.html(0/1)0.00%FAIL