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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-animations

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-animations

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

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total54.15%(106/208)50.96%(816/1510)54.04%
parsing83.81%(32/42)76.19%(397/575)69.04%
crashtests100.00%(35/35)100.00%(35/35)100.00%
responsive0.00%(0/4)0.00%(0/7)0.00%
stability0.00%(0/3)0.00%(0/3)0.00%
TestSubtestsSubtest %Status
AnimationEffect-getComputedTiming.tentative.html(0/43)0.00%FAIL
AnimationEffect-updateTiming.tentative.html(0/5)0.00%FAIL
CSSAnimation-animationName.tentative.html(0/3)0.00%FAIL
CSSAnimation-canceling.tentative.html(0/9)0.00%FAIL
CSSAnimation-compositeOrder.tentative.html(0/2)0.00%FAIL
CSSAnimation-effect.tentative.html(0/8)0.00%FAIL
CSSAnimation-finished.tentative.html(0/3)0.00%FAIL
CSSAnimation-getCurrentTime.tentative.html(0/2)0.00%FAIL
CSSAnimation-getKeyframes-crash.html(1/1)100.00%PASS
CSSAnimation-id.tentative.html(0/1)0.00%FAIL
CSSAnimation-pausing.tentative.html(0/9)0.00%FAIL
CSSAnimation-playState.tentative.html(0/5)0.00%FAIL
CSSAnimation-ready.tentative.html(0/5)0.00%FAIL
CSSAnimation-startTime.tentative.html(0/3)0.00%FAIL
Document-getAnimations.tentative.html(0/18)0.00%FAIL
Element-getAnimations-dynamic-changes.tentative.html(0/5)0.00%FAIL
Element-getAnimations.tentative.html(0/22)0.00%SKIP
KeyframeEffect-getKeyframes.tentative.html(0/32)0.00%FAIL
KeyframeEffect-setKeyframes.tentative.html(0/3)0.00%FAIL
KeyframeEffect-target.tentative.html(0/3)0.00%FAIL
animate-bg-color-with-change-during-delay.html(0/1)0.00%FAIL
animate-font-size-with-margin-override.html(0/1)0.00%FAIL
animate-with-background-color-hsla-to-legacy-rgb.html(0/1)0.00%FAIL
animate-with-background-color-oklch-001.html(0/1)0.00%FAIL
animate-with-background-color-oklch-002.html(0/2)0.00%FAIL
animate-with-color-mix-2.html(0/1)0.00%FAIL
animate-with-color-mix.html(0/6)0.00%FAIL
animate-with-relative-color.html(0/2)0.00%FAIL
animation-append-stylesheet-reverse.html(0/1)0.00%FAIL
animation-base-response-001.html(3/3)100.00%PASS
animation-base-response-002.html(1/1)100.00%PASS
animation-base-response-003.html(1/1)100.00%PASS
animation-base-response-004.html(0/1)0.00%FAIL
animation-before-initial-box-construction-001.html(0/1)0.00%FAIL
animation-change-underlying-value-changed-in-flight.html(0/2)0.00%FAIL
animation-composition-keyframes.html(0/6)0.00%FAIL
animation-composition.html(0/6)0.00%FAIL
animation-css-variable-dependent-property.html(0/1)0.00%FAIL
animation-css-variable-in-keyframe-adjusted.html(0/2)0.00%FAIL
animation-delay-008.html(1/1)100.00%PASS
animation-delay-009.html(0/1)0.00%FAIL
animation-delay-010.html(0/1)0.00%FAIL
animation-delay-011.html(1/1)100.00%PASS
animation-delay-012.html(1/1)100.00%PASS
animation-duration-infinite.html(1/1)100.00%PASS
animation-important-001.html(4/7)57.14%FAIL
animation-important-002.html(0/1)0.00%FAIL
animation-important-with-transition.html(1/5)20.00%FAIL
animation-iteration-count-009.html(4/4)100.00%PASS
animation-iteration-count-010.html(6/6)100.00%PASS
animation-iteration-count-calc.html(1/1)100.00%PASS
animation-iteration-event-001.html(0/1)0.00%SKIP
animation-iteration-event-002.html(0/1)0.00%SKIP
animation-multiple-from-to-keyframes-with-only-timing-function.html(1/1)100.00%PASS
animation-name-case-sensitive.html(1/1)100.00%PASS
animation-name-in-nested-shadow.html(0/1)0.00%FAIL
animation-name-in-shadow-part-inner-match.html(1/1)100.00%PASS
animation-name-in-shadow-part-outer-match.html(0/1)0.00%FAIL
animation-name-in-shadow-part.html(0/1)0.00%FAIL
animation-name-inline-style.html(1/1)100.00%PASS
animation-offscreen-to-onscreen.html(1/1)100.00%PASS
animation-opacity-pause-and-set-time.html(0/1)0.00%FAIL
animation-play-state-005.tentative.html(0/1)0.00%SKIP
animation-pseudo-dynamic-001.html(1/1)100.00%PASS
animation-restarted-after-changing-iteration-count-after-completion.html(0/1)0.00%FAIL
animation-style-element-replaced-with-keyframes-rule-of-same-name.html(0/1)0.00%FAIL
animation-transform-pause-and-set-time.html(0/1)0.00%FAIL
animation-transition-color-crash.html(1/1)100.00%PASS
animationevent-interface.html(0/42)0.00%FAIL
animationevent-marker-pseudoelement.html(0/1)0.00%SKIP
animationevent-pseudoelement.html(0/1)0.00%SKIP
animationevent-types.html(0/3)0.00%SKIP
cancel-animation-shadow-slot-invalidation.html(0/1)0.00%FAIL
cancel-events-on-remove.html(0/5)0.00%TIMEOUT
computed-style-animation-parsing.html(7/7)100.00%PASS
dialog-animation.html(0/1)0.00%FAIL
dialog-backdrop-animation.html(0/1)0.00%FAIL
display-contents-animates.html(0/1)0.00%FAIL
display-interpolation.html(86/138)62.32%FAIL
display-none-dont-cancel-pseudo.tentative.html(0/1)0.00%FAIL
display-none-dont-cancel.tentative.html(0/5)0.00%FAIL
display-none-prevents-starting-in-subtree.html(0/1)0.00%FAIL
display-none-to-display-block-dont-cancel.tentative.html(0/1)0.00%FAIL
display-none-to-display-block-while-running.tentative.html(0/1)0.00%FAIL
display-none-to-display-block.html(0/1)0.00%FAIL
display-via-custom-prop-animation-crash.html(1/1)100.00%PASS
empty-pseudo-class-with-animation.html(0/1)0.00%FAIL
event-dispatch.tentative.html(0/32)0.00%FAIL
event-order.tentative.html(0/6)0.00%FAIL
flip-running-animation-via-variable.html(0/1)0.00%FAIL
historical.html(1/1)100.00%PASS
idlharness.html(58/98)59.18%FAIL
inheritance-pseudo-element.html(0/1)0.00%FAIL
inheritance.html(16/16)100.00%PASS
jump-start-animation-before-phase.html(1/1)100.00%PASS
keyframes-remove-documentElement-crash.html(1/1)100.00%PASS
keyframes-rule-caching.html(1/1)100.00%PASS
keyframes-tree-scoped-property-with-var.html(0/1)0.00%FAIL
keyframes-unrelated-custom-property.html(1/1)100.00%PASS
keyframes-zero-angle-crash.html(1/1)100.00%PASS
missing-values-first-keyframe.html(0/1)0.00%FAIL
missing-values-last-keyframe.html(0/1)0.00%FAIL
missing-values-middle-keyframe.html(1/1)100.00%PASS
nested-scale-animations.html(0/1)0.00%FAIL
neutral-var-keyframe-cycle-crash.html(1/1)100.00%PASS
neutral-var-keyframe-cycle-registered-additive-crash.html(1/1)100.00%PASS
neutral-var-keyframe-cycle-registered-crash.html(1/1)100.00%PASS
parent-after-change-style-pseudo-element-flicker.html(1/1)100.00%PASS
pending-style-changes-001.html(0/2)0.00%FAIL
revert-rule-keyframes-dynamic.html(0/2)0.00%FAIL
revert-rule-keyframes.html(2/2)100.00%PASS
sample-on-last-keyframe.html(0/1)0.00%FAIL
simultaneous-animations-crash.html(1/1)100.00%PASS
style-animation-parsing.html(5/5)100.00%PASS
svg-color-visited-currentcolor.html(0/3)0.00%FAIL
svg-transform-animation.html(0/1)0.00%FAIL
svg-use-transform-keyframes-custom-property-override.html(0/1)0.00%FAIL
text-decoration-inset-auto.html(55/90)61.11%FAIL
transform-animation-under-large-scale.html(1/1)100.00%PASS
transition-properties-not-animatable.html(105/126)83.33%FAIL
transition-ready-time-offscreen.html(0/1)0.00%FAIL
translation-animation-on-important-property.html(1/1)100.00%PASS
translation-animation-subpixel-offset.html(1/1)100.00%PASS
webkit-writing-mode-crash.html(1/1)100.00%PASS