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 TestsWPT History

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

wpt / css / css-shadow

Score history
1 month3 months6 months1 year2 years4 yearsAll time
0%20%40%60%80%100%May 2025Jul 2025Sep 2025Nov 2025Jan 2026Mar 2026May 2026Jul 2026Sep 2026css/css-shadow

Data from commit:
ab0e30b Give form controls a UA default font-family (#940) (2026-09-25)

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total7.05%(14/208)6.73%(24/491)4.89%
part2.08%(1/48)2.08%(3/187)1.60%
TestSubtestsSubtest %Status
chrome-1492368-crash.html(1/1)100.00%PASS
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-dynamic-remove-style-detached.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(0/1)0.00%FAIL
css-scoping-shadow-with-rules.html(0/1)0.00%FAIL
font-face-001.html(0/1)0.00%FAIL
font-face-002.html(0/1)0.00%FAIL
font-face-003.html(0/1)0.00%FAIL
font-face-004.html(0/1)0.00%FAIL
font-face-005.html(0/1)0.00%FAIL
font-face-006.html(0/1)0.00%FAIL
font-face-007.html(0/1)0.00%FAIL
font-face-008.html(0/1)0.00%FAIL
font-face-009.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-changing-001.html(0/5)0.00%FAIL
has-slotted-changing-002.html(0/3)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-changing-001.tentative.html(0/1)0.00%FAIL
has-slotted-functional-changing-002.tentative.html(0/1)0.00%FAIL
has-slotted-functional-changing-003.tentative.html(0/1)0.00%FAIL
has-slotted-functional-changing-004.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
has-slotted-manual-assignment.html(0/4)0.00%FAIL
has-slotted-query-selector.html(0/8)0.00%FAIL
host-context-parsing.html(0/7)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-descendant-invalidation.html(0/1)0.00%FAIL
host-dom-001.html(0/1)0.00%FAIL
host-functional-descendant-invalidation.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-in-document-descendant.html(1/1)100.00%PASS
host-in-host-context-selector.html(1/1)100.00%PASS
host-in-host-selector.html(1/1)100.00%PASS
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-is-featureless.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-parsing.html(0/7)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
hover-invalidates-slotted-descendant.html(0/1)0.00%SKIP
idlharness.html(8/12)66.67%FAIL
keyframes-001.html(0/1)0.00%FAIL
keyframes-002.html(0/1)0.00%FAIL
keyframes-003.html(0/1)0.00%FAIL
keyframes-004.html(0/1)0.00%FAIL
keyframes-005.html(0/1)0.00%FAIL
keyframes-006.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
scope-pseudo-in-shadow.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-cascade-order-001.html(0/64)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-removal-invalidation.html(0/1)0.00%FAIL
shadow-host-style-sharing.html(0/6)0.00%FAIL
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-multiple-links.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-003.html(0/2)0.00%FAIL
shadow-reassign-dynamic-004.html(0/1)0.00%FAIL
shadow-reassign-dynamic-005-crash.html(1/1)100.00%PASS
shadow-reassign-dynamic-006.html(1/1)100.00%PASS
shadow-root-insert-into-document.html(0/1)0.00%FAIL
shadow-shared-style-cache-001.html(0/1)0.00%FAIL
slot-non-html-display-value.html(1/1)100.00%PASS
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-invalidation.html(0/1)0.00%FAIL
slotted-link.html(0/1)0.00%FAIL
slotted-matches.html(0/1)0.00%FAIL
slotted-nested.html(0/2)0.00%FAIL
slotted-parsing.html(0/36)0.00%FAIL
slotted-placeholder.html(1/1)100.00%PASS
slotted-slot.html(0/1)0.00%FAIL
slotted-specificity-002.html(0/1)0.00%FAIL
slotted-specificity.html(0/1)0.00%FAIL
slotted-text-with-flex.html(0/1)0.00%FAIL
slotted-user-agent-part-invalidation.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
stylesheet-title-002.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