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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 / cssom

Spec: CSSOM ↗

Runs: Chrome 155.0.8039.0 (wpt@6ec9fd59f, 2026-09-03) | Firefox 157.0a1 (wpt@6ec9fd59f, 2026-09-03) | Safari 251 preview (wpt@5ce815a83, 2026-08-27) | Ladybird 1.0-795e1 (wpt@7e3d005d7, 2026-09-03) | Servo Servo 0.6 (wpt@09159dcb3, 2026-09-02) | Blitz 188486089 (wpt@a95401e4e, 2026-09-02)

Sort areas: alphabetical | by subtest count

AreaChromeFirefoxSafariLadybirdServoBlitz
Total96.9%3958/408597.3%3975/408595.9%3919/408589.1%3639/408584.7%3462/408552.0%2123/4085
TestChromeFirefoxSafariLadybirdServoBlitz
CSS-namespace-object-class-string.html4/44/44/44/40/40/4
CSSConditionRule-conditionText.htmlPASSPASSPASSPASSPASSFAIL
CSSContainerRule.tentative.html2/22/22/22/20/20/2
CSSCounterStyleRule.htmlPASSPASSPASSPASSFAILFAIL
CSSFontFaceRule.htmlPASSPASSPASSPASSPASSFAIL
CSSFontFeatureValuesRule.html8/80/81/88/86/80/8
CSSGroupingRule-cssRules.htmlPASSPASSPASSPASSPASSFAIL
CSSGroupingRule-insertRule.html7/77/77/77/77/70/7
CSSKeyframeRule.html2/22/22/22/21/20/2
CSSKeyframesRule.html1/22/21/22/21/20/2
CSSNamespaceRule.htmlPASSPASSPASSPASSPASSFAIL
CSSRuleList-appendRule-keyframe-001-crash.htmlPASSPASSPASSPASSPASSPASS
CSSRuleList-appendRule-keyframe-002-crash.htmlPASSPASSPASSPASSPASSPASS
CSSRuleList.htmlPASSPASSPASSPASSPASSFAIL
CSSStyleDeclaration-iterator.htmlPASSPASSPASSPASSPASSFAIL
CSSStyleRule-set-selectorText-namespace.html5/55/55/55/55/50/5
CSSStyleRule-set-selectorText.html82/8282/8282/8282/8280/820/82
CSSStyleRule.html10/1010/1010/1010/107/100/10
CSSStyleSheet-constructable-baseURL.html3/33/33/33/32/30/3
CSSStyleSheet-constructable-concat.htmlPASSPASSPASSPASSTIMEOUTFAIL
CSSStyleSheet-constructable-cssRules.htmlPASSPASSPASSPASSFAILFAIL
CSSStyleSheet-constructable-disabled-regular-sheet-insertion.htmlPASSPASSPASSPASSPASSFAIL
CSSStyleSheet-constructable-disallow-import.tentative.html4/44/44/44/42/40/4
CSSStyleSheet-constructable-duplicate.html4/44/44/44/40/40/4
CSSStyleSheet-constructable-insertRule-base-uri.htmlPASSPASSPASSPASSFAILFAIL
CSSStyleSheet-constructable-invalidation.html3/33/33/33/30/30/3
CSSStyleSheet-constructable-replace-cssRules.html2/22/22/22/20/20/2
CSSStyleSheet-constructable-replace-on-regular-sheet.html3/33/33/30/30/30/3
CSSStyleSheet-constructable-replace-thenable.htmlPASSPASSPASSPASSPASSFAIL
CSSStyleSheet-constructable.html32/3232/3232/3230/3212/320/32
CSSStyleSheet-modify-after-removal.html2/22/22/22/22/20/2
CSSStyleSheet-template-adoption.htmlPASSPASSPASSFAILFAILFAIL
CSSStyleSheet.html17/1717/1717/1717/1717/170/17
HTMLLinkElement-disabled-001.html2/22/22/22/21/20/2
HTMLLinkElement-disabled-002.htmlPASSPASSPASSPASSFAILSKIP
HTMLLinkElement-disabled-003.htmlPASSPASSPASSPASSPASSSKIP
HTMLLinkElement-disabled-004.htmlPASSPASSPASSPASSPASSSKIP
HTMLLinkElement-disabled-005.htmlPASSPASSPASSPASSPASSSKIP
HTMLLinkElement-disabled-006.htmlPASSPASSPASSPASSPASSSKIP
HTMLLinkElement-disabled-007.htmlPASSPASSPASSPASSPASSSKIP
HTMLLinkElement-disabled-alternate.htmlPASSPASSPASSPASSPASSPASS
HTMLLinkElement-load-event-002.html2/22/22/21/22/20/2
HTMLLinkElement-load-event.htmlPASSPASSPASSFAILFAILFAIL
HTMLStyleElement-load-event.htmlPASSPASSPASSPASSPASSFAIL
MediaList.htmlPASSPASSPASSPASSPASSFAIL
MediaList2.xhtml5/55/55/55/55/50/5
MutationObserver-style.html2/22/22/22/22/20/2
StyleSheetList-constructable-shadow-with-style-recalc.htmlPASSPASSPASSPASSPASSFAIL
StyleSheetList-constructable-shadow.htmlPASSPASSPASSPASSPASSFAIL
StyleSheetList-constructable-with-style-recalc.htmlPASSPASSPASSPASSPASSFAIL
StyleSheetList-constructable.htmlPASSPASSPASSPASSPASSFAIL
StyleSheetList.htmlPASSPASSPASSPASSPASSFAIL
adoptedstylesheets-adopt-link.tentative.htmlFAILFAILFAILFAILFAILFAIL
adoptedstylesheets-adopt-style-subresource.tentative.htmlFAILFAILFAILFAILFAILFAIL
adoptedstylesheets-adopt-style.tentative.htmlFAILFAILFAILFAILFAILFAIL
adoptedstylesheets-cascade-order.html13/1313/1313/1313/130/13NOT RUN
adoptedstylesheets-invalid-assignment-crash.htmlPASSPASSPASSPASSPASSPASS
adoptedstylesheets-modify-array-and-sheet.html3/33/33/33/30/30/3
adoptedstylesheets-observablearray.html4/44/44/44/41/40/4
all-initial-csstext.htmlPASSPASSPASSPASSPASSFAIL
at-namespace.htmlPASSPASSPASSPASSPASSFAIL
base-uri.html3/33/33/30/31/30/3
border-shorthand-serialization.html3/33/33/33/33/30/3
caretPositionFromPoint-audioVideo.html2/20/22/21/20/20/2
caretPositionFromPoint-in-flex-container.html3/33/33/30/30/30/3
caretPositionFromPoint-with-transformation.htmlPASSPASSPASSPASSFAILSKIP
caretPositionFromPoint.html7/77/77/75/71/70/7
caretRangeFromPoint-replace-document.tentative.htmlFAILPASSPASSFAILFAILFAIL
caretRangeFromPoint-textarea-transform.tentative.html0/22/22/20/20/20/2
caretRangeFromPoint.tentative.html7/88/86/80/80/80/8
change-rule-with-layers-crash.htmlPASSPASSPASSPASSPASSPASS
computed-style-001.html4/44/44/44/44/43/4
computed-style-002.htmlPASSPASSPASSPASSPASSFAIL
computed-style-003.htmlPASSPASSPASSPASSPASSFAIL
computed-style-004.html2/22/22/22/22/20/2
computed-style-005.html4/44/44/44/44/44/4
computed-style-set-property.html5/55/55/55/54/50/5
css-style-attr-decl-block.html7/77/77/76/77/74/7
css-style-attribute-modifications.htmlPASSPASSPASSPASSPASSPASS
css-style-declaration-modifications.html4/44/44/44/44/40/4
css-style-reparse.html2/22/22/22/20/20/2
cssimportrule-parent.htmlPASSPASSPASSFAILFAILFAIL
cssimportrule-sheet-identity.htmlPASSPASSPASSPASSFAILFAIL
cssimportrule.html11/1111/1111/1111/113/110/11
cssom-cssText-serialize.htmlPASSPASSPASSPASSPASSPASS
cssom-cssstyledeclaration-set.htmlPASSPASSPASSPASSPASSPASS
cssom-fontfacerule-constructors.html1/22/22/22/22/20/2
cssom-fontfacerule.htmlPASSPASSPASSPASSPASSFAIL
cssom-getPropertyValue-common-checks.html10/1111/118/1111/1111/1111/11
cssom-pagerule.html18/2222/226/2222/220/220/22
cssom-ruleTypeAndOrder.html7/77/77/77/76/70/7
cssom-setProperty-shorthand.html76/7676/7676/7676/7676/7676/76
cssstyledeclaration-all-shorthand.html27/2727/2727/2727/2727/2721/27
cssstyledeclaration-cssfontrule.tentative.htmlFAILPASSPASSPASSPASSFAIL
cssstyledeclaration-csstext-all-shorthand.html5/66/66/65/66/65/6
cssstyledeclaration-csstext-final-delimiter.html3/33/33/33/33/33/3
cssstyledeclaration-csstext-important.htmlPASSPASSPASSPASSPASSPASS
cssstyledeclaration-csstext-setter.window.html9/99/99/99/99/99/9
cssstyledeclaration-csstext.html10/1111/1110/1110/1111/1111/11
cssstyledeclaration-custom-properties.htmlPASSPASSPASSFAILFAILFAIL
cssstyledeclaration-mutability.html3/33/33/33/33/31/3
cssstyledeclaration-mutationrecord-001.htmlPASSPASSPASSPASSPASSFAIL
cssstyledeclaration-mutationrecord-002.htmlPASSPASSPASSPASSPASSFAIL
cssstyledeclaration-mutationrecord-003.htmlPASSPASSPASSPASSPASSFAIL
cssstyledeclaration-mutationrecord-004.htmlPASSPASSPASSPASSPASSFAIL
cssstyledeclaration-mutationrecord-005.htmlPASSPASSPASSPASSPASSFAIL
cssstyledeclaration-nested.htmlPASSPASSPASSPASSPASSFAIL
cssstyledeclaration-properties.htmlFAILPASSPASSPASSPASSFAIL
cssstyledeclaration-registered-custom-properties.html2/22/22/20/20/20/2
cssstyledeclaration-removeProperty-all.html2/22/22/22/22/21/2
cssstyledeclaration-setter-attr.html2/22/22/22/22/22/2
cssstyledeclaration-setter-declarations.html4/44/44/44/44/40/4
cssstyledeclaration-setter-form-controls.html8/88/88/88/88/88/8
cssstyledeclaration-setter-logical.htmlPASSPASSPASSPASSPASSFAIL
declaration-block-all-crash.htmlPASSPASSPASSPASSPASSPASS
delete-namespace-rule-when-child-rule-exists.htmlPASSPASSPASSPASSPASSFAIL
escape.html10/1010/1010/1010/109/109/10
flex-serialization.html4/54/54/54/54/50/5
font-family-serialization-001.html21/2419/2420/2414/2419/2419/24
font-shorthand-serialization.htmlPASSPASSFAILPASSPASSPASS
font-variant-shorthand-serialization.html6/76/77/76/76/76/7
getComputedStyle-animations-replaced-into-ib-split.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-detached-subtree.html2/65/62/62/60/60/6
getComputedStyle-display-none-001.html2/22/21/22/22/20/2
getComputedStyle-display-none-002.htmlPASSPASSPASSPASSPASSFAIL
getComputedStyle-display-none-003.htmlPASSPASSPASSPASSPASSFAIL
getComputedStyle-display-none-shadow-invalidation.html2/22/21/22/22/2NOT RUN
getComputedStyle-dynamic-subdoc.htmlPASSPASSPASSPASSPASSFAIL
getComputedStyle-getter-v-properties.tentative.html10/1010/1010/1010/1010/106/10
getComputedStyle-insets-absolute-crash.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-insets-absolute-logical-crash.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-insets-absolute-roundtrip.html4/44/40/40/44/44/4
getComputedStyle-insets-absolute.html324/324324/324324/324288/324306/324108/324
getComputedStyle-insets-fixed.html324/324324/324324/324288/324306/324108/324
getComputedStyle-insets-grid.htmlPASSPASSFAILPASSFAILFAIL
getComputedStyle-insets-multicol-absolute-crash.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-insets-nobox.html216/216216/216216/216216/216216/216216/216
getComputedStyle-insets-relative.html252/252252/252252/252180/252252/252108/252
getComputedStyle-insets-relpos-inline.html4/42/44/44/44/40/4
getComputedStyle-insets-static.html216/216216/216216/216216/216216/216216/216
getComputedStyle-insets-sticky-container-for-abspos.html252/252252/252252/252180/252180/252180/252
getComputedStyle-insets-sticky.html252/252252/252252/252180/252180/252180/252
getComputedStyle-layout-dependent-removed-ib-sibling.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-layout-dependent-replaced-into-ib-split.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-line-height.html4/44/44/43/44/44/4
getComputedStyle-logical-enumeration.htmlPASSPASSPASSPASSPASSFAIL
getComputedStyle-margins-roundtrip.html4/44/40/40/44/44/4
getComputedStyle-property-order.htmlPASSPASSPASSFAILPASSFAIL
getComputedStyle-pseudo-checkmark.html3/32/33/32/32/31/3
getComputedStyle-pseudo-picker-icon.html3/32/33/32/31/30/3
getComputedStyle-pseudo-picker.html8/96/99/96/96/91/9
getComputedStyle-pseudo-with-argument.html22/2222/2222/2213/2217/220/22
getComputedStyle-pseudo.html25/2823/2827/2824/2814/281/28
getComputedStyle-resolved-colors.html13/1313/1313/1313/1313/1313/13
getComputedStyle-resolved-min-max-clamping.htmlPASSPASSPASSFAILPASSFAIL
getComputedStyle-resolved-min-size-auto.html10/1616/1610/169/1616/169/16
getComputedStyle-special-chars-crash.htmlPASSPASSPASSPASSPASSPASS
getComputedStyle-sticky-pos-percent.htmlPASSPASSPASSFAILPASSFAIL
getComputedStyle-width-scroll.tentative.htmlFAILPASSFAILPASSPASSPASS
historical.html20/2015/2014/2020/2020/2013/20
idlharness.html440/497445/497438/497493/497316/4970/497
inline-style-001.html5/55/55/55/55/53/5
insert-dir-rule-crash.htmlPASSPASSPASSPASSPASSPASS
insert-dir-rule-in-iframe-crash.htmlPASSPASSPASSPASSPASSPASS
insert-invalid-where-rule-crash.htmlPASSPASSPASSPASSPASSPASS
insertRule-across-context.html2/22/22/22/22/20/2
insertRule-charset-no-index.html2/22/22/22/22/20/2
insertRule-from-script.htmlPASSPASSPASSPASSPASSFAIL
insertRule-import-no-index.html2/22/22/22/22/20/2
insertRule-import-no-sheet-crash.htmlPASSPASSPASSPASSPASSPASS
insertRule-import-trailing-garbage-crash.htmlPASSPASSPASSPASSPASSPASS
insertRule-namespace-after-import.html2/22/22/22/22/20/2
insertRule-namespace-no-index.html3/33/33/33/33/30/3
insertRule-no-index.html2/22/22/22/22/20/2
insertRule-syntax-error-01.htmlPASSPASSPASSPASSPASSFAIL
invalid-pseudo-elements.htmlPASSPASSPASSPASSPASSFAIL
link-element-stylesheet-title.html2/21/22/20/21/20/2
medialist-appendmedium-parse-single-and-dedup.html3/31/33/33/31/30/3
medialist-deletemedium-parse-and-remove-all.html2/22/22/22/22/20/2
medialist-dynamic-001.htmlPASSPASSPASSPASSPASSFAIL
medialist-interfaces-001.html4/44/44/44/44/40/4
medialist-interfaces-002.html3/33/33/33/32/30/3
medialist-interfaces-004.html2/22/22/22/22/20/2
mediaquery-sort-dedup.html2/22/22/22/22/20/2
overflow-serialization.html10/1010/1010/1010/1010/100/10
page-descriptors.html9/2121/210/2121/210/210/21
preferred-stylesheet-order.htmlPASSPASSPASSPASSFAILFAIL
preferred-stylesheet-reversed-order.htmlPASSPASSPASSPASSPASSFAIL
property-accessors.html9/90/99/99/90/90/9
removerule-invalidation-crash.htmlPASSPASSPASSPASSPASSPASS
resolved-border-width.html0/22/20/22/22/22/2
rule-restrictions.html1/22/21/21/20/20/2
selectorSerialize.html23/2323/2323/2323/2323/230/23
selectorText-modification-restyle-001.htmlPASSPASSPASSPASSPASSFAIL
selectorText-modification-restyle-002.html2/22/22/22/22/20/2
serialization-CSSDeclaration-with-important.html4/44/44/44/44/44/4
serialize-all-longhands.html2/22/22/22/22/20/2
serialize-custom-props.html20/2020/2020/2020/2020/2020/20
serialize-media-rule.html12/1212/1212/1212/1211/120/12
serialize-namespaced-type-selectors.html60/6060/6060/6060/6060/600/60
serialize-values.html687/697691/697687/697655/697672/697667/697
serialize-variable-reference.html4/44/44/44/44/44/4
set-selector-text-attachment.htmlPASSPASSPASSPASSPASSFAIL
set-selector-text-detached-rule-delete-crash.htmlPASSPASSPASSPASSPASSPASS
set-selector-text-detached-rule-replace-crash.htmlPASSPASSPASSPASSPASSPASS
setproperty-null-undefined.html4/44/44/44/44/42/4
shorthand-serialization.html7/77/77/77/77/77/7
shorthand-values.html19/2120/2119/2117/2120/2120/21
style-attr-clone.htmlPASSPASSPASSPASSPASSPASS
style-attr-update-across-documents.htmlPASSPASSPASSPASSPASSSKIP
style-sheet-interfaces-001.html7/77/77/76/73/70/7
style-sheet-interfaces-002.html2/22/22/22/22/20/2
stylesheet-cross-origin-redirect-quirks.sub.html0/44/42/44/42/40/4
stylesheet-replacedata-dynamic.htmlPASSPASSPASSPASSPASSFAIL
stylesheet-same-origin.sub.html7/76/77/72/76/70/7
stylesheet-title.html2/22/22/22/20/20/2
ttwf-cssom-doc-ext-load-count.html3/33/33/30/33/30/3
ttwf-cssom-doc-ext-load-tree-order.html6/66/66/61/61/60/6
ttwf-cssom-document-extension.htmlPASSPASSPASSPASSPASSFAIL
variable-names.html6/66/66/66/66/60/6
xml-stylesheet-pi-in-doctype.xhtmlFAILPASSFAILPASSPASSPASS