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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 / css-shadow

Spec: CSS Shadow ↗

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 1.0-1706f (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 month3 months6 months1 year2 years4 yearsAll time
0%20%40%60%80%100%Nov 2025Dec 2025Jan 2026Feb 2026Mar 2026Apr 2026May 2026Jun 2026Jul 2026Aug 2026Sep 2026Oct 2026ChromeFirefoxSafariLadybirdServoBlitz

Sort: alphabetical | by subtest count

AreaChromeFirefoxSafariLadybirdServoBlitz
Total94.9%469/49490.0%445/49488.4%437/49476.9%380/49471.2%352/4944.8%24/494
part99.4%186/18793.5%175/18794.6%177/18781.8%153/18771.1%133/1871.6%3/187
TestChromeFirefoxSafariLadybirdServoBlitz
Total92.1%283/30787.9%270/30784.6%260/30773.9%227/30771.3%219/3076.8%21/307
chrome-1492368-crash.htmlPASSPASSPASSPASSPASSPASS
css-scoping-shadow-assigned-node-with-before-after.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-assigned-node-with-rules.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-dynamic-remove-style-detached.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-host-functional-rule.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-host-namespace.htmlPASSFAILFAILFAILFAILFAIL
css-scoping-shadow-host-rule.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-host-with-before-after.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-invisible-slot.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-nested-slot-display-override.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-root-hides-children.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-slot-display-override.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-slot-fallback.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-slot-style.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-slot.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-slotted-nested.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-slotted-rule.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-with-outside-rules.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-with-rules-no-style-leak.htmlPASSPASSPASSPASSPASSFAIL
css-scoping-shadow-with-rules.htmlPASSPASSPASSPASSPASSFAIL
font-face-001.htmlFAILFAILFAILFAILFAILFAIL
font-face-002.htmlPASSPASSPASSPASSPASSFAIL
font-face-003.htmlPASSPASSPASSPASSPASSFAIL
font-face-004.htmlPASSPASSPASSPASSPASSFAIL
font-face-005.htmlFAILFAILFAILFAILFAILFAIL
font-face-006.htmlPASSPASSPASSFAILPASSFAIL
font-face-007.htmlFAILFAILPASSFAILFAILFAIL
font-face-008.htmlFAILFAILPASSFAILFAILFAIL
font-face-009.htmlFAILFAILPASSFAILFAILFAIL
has-slotted-001.htmlPASSPASSFAILFAILFAILFAIL
has-slotted-002.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-003.htmlPASSPASSFAILFAILFAILFAIL
has-slotted-changing-001.html5/55/51/51/51/50/5
has-slotted-changing-002.html3/33/30/30/30/30/3
has-slotted-flattened-001.htmlPASSPASSFAILFAILFAILFAIL
has-slotted-flattened-002.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-flattened-003.htmlPASSPASSFAILFAILFAILFAIL
has-slotted-flattened-004.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-001.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-002.tentative.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-003.tentative.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-004.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-005.tentative.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-006.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-007.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-changing-001.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-changing-002.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-changing-003.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-changing-004.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-flattened-001.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-flattened-002.tentative.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-flattened-003.tentative.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-flattened-004.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-functional-flattened-005.tentative.htmlPASSPASSPASSPASSPASSFAIL
has-slotted-functional-flattened-006.tentative.htmlFAILFAILFAILFAILFAILFAIL
has-slotted-manual-assignment.html4/44/40/40/40/40/4
has-slotted-query-selector.html8/88/80/80/80/80/8
host-context-parsing.html7/75/75/75/75/70/7
host-context-specificity-001.htmlPASSFAILFAILFAILFAILFAIL
host-context-specificity-002.htmlPASSFAILFAILFAILFAILFAIL
host-context-specificity-003.htmlPASSFAILFAILFAILFAILFAIL
host-defined.htmlPASSPASSPASSPASSPASSFAIL
host-descendant-001.htmlPASSPASSPASSPASSPASSFAIL
host-descendant-002.htmlPASSPASSPASSPASSPASSFAIL
host-descendant-003.htmlPASSPASSPASSPASSPASSFAIL
host-descendant-invalidation.htmlPASSPASSPASSPASSPASSFAIL
host-dom-001.htmlPASSPASSPASSPASSPASSFAIL
host-functional-descendant-invalidation.htmlPASSPASSPASSPASSPASSFAIL
host-has-001.tentative.htmlFAILPASSPASSPASSFAILFAIL
host-has-002.tentative.htmlFAILFAILPASSPASSFAILFAIL
host-has-003.tentative.htmlFAILPASSPASSPASSFAILFAIL
host-has-internal-001.htmlPASSFAILPASSPASSFAILFAIL
host-has-internal-002.htmlPASSFAILPASSPASSFAILFAIL
host-has-internal-003.htmlPASSFAILPASSPASSFAILFAIL
host-has-internal-004.htmlPASSFAILPASSPASSFAILFAIL
host-in-document-descendant.htmlPASSPASSPASSPASSPASSPASS
host-in-host-context-selector.htmlPASSPASSPASSPASSPASSPASS
host-in-host-selector.htmlPASSFAILPASSPASSFAILPASS
host-is-001.htmlPASSPASSPASSPASSPASSFAIL
host-is-002.htmlPASSPASSPASSPASSPASSFAIL
host-is-003.htmlPASSPASSPASSPASSPASSFAIL
host-is-004.htmlPASSPASSPASSPASSPASSFAIL
host-is-005.htmlPASSPASSPASSPASSPASSFAIL
host-is-006.htmlPASSPASSPASSPASSPASSFAIL
host-is-featureless.htmlPASSPASSPASSPASSPASSFAIL
host-multiple-001.htmlPASSPASSPASSPASSPASSFAIL
host-multiple-002.htmlPASSPASSPASSPASSPASSFAIL
host-multiple-003.htmlPASSPASSPASSPASSPASSFAIL
host-multiple-004.htmlPASSFAILPASSPASSFAILFAIL
host-multiple-005.htmlPASSPASSPASSPASSPASSFAIL
host-nested-001.htmlPASSPASSPASSPASSPASSFAIL
host-not-001.htmlPASSPASSPASSPASSPASSFAIL
host-parsing.html7/77/77/77/77/70/7
host-slotted-001.htmlPASSPASSPASSPASSPASSFAIL
host-specificity-002.htmlPASSPASSPASSPASSPASSFAIL
host-specificity-003.htmlPASSPASSPASSPASSPASSFAIL
host-specificity.htmlPASSPASSPASSPASSPASSFAIL
host-with-default-namespace-001.htmlPASSPASSPASSPASSPASSFAIL
hover-invalidates-slotted-descendant.htmlPASSPASSPASSPASSPASSSKIP
idlharness.html12/1212/1212/1212/1212/128/12
keyframes-001.htmlPASSPASSPASSFAILFAILFAIL
keyframes-002.htmlFAILFAILPASSPASSFAILFAIL
keyframes-003.htmlPASSPASSPASSPASSFAILFAIL
keyframes-004.htmlPASSPASSPASSPASSFAILFAIL
keyframes-005.htmlPASSFAILPASSFAILFAILFAIL
keyframes-006.htmlPASSPASSPASSPASSPASSFAIL
reslot-text-inheritance.htmlPASSPASSPASSPASSPASSFAIL
same-rules-bug-2044746-crash.htmlPASSPASSPASSPASSPASSPASS
same-rules-bug-2044746.htmlPASSPASSPASSPASSPASSFAIL
scope-pseudo-in-shadow.htmlPASSPASSPASSPASSPASSFAIL
scoped-reference-animation-001.htmlPASSPASSPASSPASSPASSPASS
scoped-reference-animation-002.htmlPASSFAILFAILPASSPASSFAIL
shadow-assign-dynamic-001.htmlPASSPASSPASSPASSPASSFAIL
shadow-at-import.htmlPASSPASSPASSPASSPASSFAIL
shadow-cascade-order-001.html64/6464/6464/6464/6464/640/64
shadow-directionality-001.tentative.htmlPASSPASSPASSPASSFAILFAIL
shadow-directionality-002.tentative.htmlPASSPASSPASSPASSFAILFAIL
shadow-disabled-sheet-001.htmlPASSPASSPASSPASSPASSFAIL
shadow-fallback-dynamic-001.htmlPASSPASSPASSPASSPASSFAIL
shadow-fallback-dynamic-002.htmlPASSPASSPASSPASSPASSFAIL
shadow-fallback-dynamic-003.htmlPASSPASSPASSPASSPASSFAIL
shadow-fallback-dynamic-004.htmlPASSPASSPASSPASSPASSPASS
shadow-fallback-dynamic-005.htmlPASSPASSPASSPASSPASSPASS
shadow-host-removal-invalidation.htmlPASSPASSPASSPASSFAILFAIL
shadow-host-style-sharing.html6/66/66/66/62/60/6
shadow-host-with-before-after.htmlPASSPASSPASSPASSPASSFAIL
shadow-link-rel-stylesheet-no-style-leak.htmlPASSPASSPASSPASSPASSFAIL
shadow-link-rel-stylesheet.htmlPASSPASSPASSPASSPASSFAIL
shadow-multiple-links.htmlPASSPASSPASSPASSPASSFAIL
shadow-reassign-dynamic-001.htmlPASSPASSPASSPASSPASSFAIL
shadow-reassign-dynamic-002.htmlPASSPASSPASSPASSPASSFAIL
shadow-reassign-dynamic-003.html2/22/22/22/22/20/2
shadow-reassign-dynamic-004.htmlPASSPASSPASSPASSPASSFAIL
shadow-reassign-dynamic-005-crash.htmlPASSPASSPASSPASSPASSPASS
shadow-reassign-dynamic-006.htmlPASSPASSPASSPASSPASSPASS
shadow-root-insert-into-document.htmlPASSPASSPASSPASSPASSFAIL
shadow-shared-style-cache-001.htmlPASSPASSPASSPASSFAILFAIL
slot-non-html-display-value.htmlPASSPASSPASSFAILFAILPASS
slotted-details-content.htmlPASSPASSPASSFAILFAILFAIL
slotted-file-selector-button.htmlPASSPASSPASSFAILFAILPASS
slotted-has-001.htmlFAILPASSPASSPASSFAILFAIL
slotted-has-002.htmlFAILPASSPASSPASSFAILFAIL
slotted-has-003.htmlFAILPASSPASSPASSFAILFAIL
slotted-has-004.htmlFAILPASSPASSPASSFAILFAIL
slotted-invalidation.htmlPASSPASSPASSPASSPASSFAIL
slotted-link.htmlPASSPASSPASSPASSPASSFAIL
slotted-matches.htmlPASSPASSPASSPASSPASSFAIL
slotted-nested.html2/22/22/22/22/20/2
slotted-parsing.html39/3934/3935/3914/3928/390/39
slotted-placeholder.htmlPASSPASSPASSFAILFAILPASS
slotted-slot.htmlPASSPASSPASSPASSPASSFAIL
slotted-specificity-002.htmlPASSPASSPASSPASSPASSFAIL
slotted-specificity.htmlPASSPASSPASSPASSPASSFAIL
slotted-text-with-flex.htmlPASSPASSPASSPASSPASSFAIL
slotted-user-agent-part-invalidation.htmlPASSPASSPASSFAILFAILFAIL
slotted-with-pseudo-element.htmlPASSPASSPASSFAILFAILFAIL
stylesheet-title-001.htmlPASSPASSPASSPASSPASSFAIL
stylesheet-title-002.htmlPASSPASSPASSPASSPASSFAIL
svg-id-ref-001.htmlPASSPASSPASSFAILPASSFAIL
whitespace-crash-001.htmlPASSPASSPASSPASSPASSFAIL