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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-transitions

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-transitions

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

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total43.46%(54/142)38.03%(925/3453)26.79%
animations29.66%(0/11)0.00%(505/711)71.03%
parsing97.62%(15/18)83.33%(246/252)97.62%
crashtests100.00%(10/10)100.00%(10/10)100.00%
render-blocking100.00%(1/1)100.00%(1/1)100.00%
TestSubtestsSubtest %Status
AnimationEffect-getComputedTiming.tentative.html(0/22)0.00%FAIL
CSSTransition-canceling.tentative.html(0/11)0.00%FAIL
CSSTransition-currentTime.tentative.html(0/5)0.00%FAIL
CSSTransition-effect.tentative.html(0/10)0.00%FAIL
CSSTransition-finished.tentative.html(0/1)0.00%FAIL
CSSTransition-not-canceling.tentative.html(0/2)0.00%FAIL
CSSTransition-ready.tentative.html(0/2)0.00%FAIL
CSSTransition-startTime.tentative.html(0/5)0.00%FAIL
CSSTransition-transitionProperty.tentative.html(0/1)0.00%FAIL
Document-getAnimations.tentative.html(0/7)0.00%FAIL
Element-getAnimations.tentative.html(0/7)0.00%FAIL
KeyframeEffect-getKeyframes-width-and-height-transition.tentative.html(0/2)0.00%FAIL
KeyframeEffect-getKeyframes.tentative.html(0/5)0.00%FAIL
KeyframeEffect-setKeyframes.tentative.html(0/8)0.00%FAIL
KeyframeEffect-target.tentative.html(0/3)0.00%FAIL
after-change-style-inherited-try-fallback.html(0/1)0.00%FAIL
after-change-style-inherited.html(1/6)16.67%FAIL
all-interpolates-same-as-explicit-property.html(30/32)93.75%FAIL
allow-discrete-auto-inset.html(1/1)100.00%PASS
before-load-001.html(0/1)0.00%SKIP
changing-while-transition-001.html(1/1)100.00%PASS
changing-while-transition-002.html(1/1)100.00%PASS
changing-while-transition-003.html(1/1)100.00%PASS
changing-while-transition-004.html(1/1)100.00%PASS
currentcolor-animation-001.html(1/1)100.00%PASS
custom-property-and-allow-discrete.html(0/2)0.00%FAIL
disconnected-element-001.html(0/6)0.00%SKIP
display-none-no-animations.html(0/1)0.00%FAIL
dynamic-root-element.html(0/1)0.00%FAIL
event-dispatch.tentative.html(0/30)0.00%FAIL
events-001.html(0/9)0.00%SKIP
events-002.html(0/2)0.00%SKIP
events-003.html(0/1)0.00%SKIP
events-004.html(0/2)0.00%SKIP
events-005.html(0/3)0.00%SKIP
events-006.html(0/2)0.00%SKIP
events-007.html(1/1)100.00%PASS
events-008.html(0/3)0.00%SKIP
historical.html(1/1)100.00%PASS
idlharness-2.html(7/19)36.84%FAIL
idlharness.html(26/64)40.62%FAIL
inert-while-transitioning-to-display-none.html(0/1)0.00%FAIL
infinite-duration-crash.html(1/1)100.00%PASS
inherit-background-color-transition.html(0/1)0.00%FAIL
inherit-height-transition.html(0/1)0.00%SKIP
inheritance.html(8/8)100.00%PASS
no-transition-for-unchanged-pointer-valued-properties.html(0/1)0.00%FAIL
non-rendered-element-001.html(0/4)0.00%SKIP
non-rendered-element-002.html(0/1)0.00%SKIP
non-rendered-element-004.tentative.html(0/1)0.00%SKIP
properties-value-001.html(0/580)0.00%SKIP
properties-value-002.html(0/18)0.00%SKIP
properties-value-003.html(0/122)0.00%SKIP
properties-value-implicit-001.html(0/62)0.00%SKIP
properties-value-inherit-001.html(0/580)0.00%SKIP
properties-value-inherit-002.html(0/580)0.00%SKIP
properties-value-inherit-003.html(0/62)0.00%SKIP
pseudo-element-transform.html(0/1)0.00%FAIL
pseudo-elements-001.html(0/4)0.00%FAIL
pseudo-elements-002.html(1/1)100.00%PASS
retargetted-transition-with-box-sizing.html(1/1)100.00%PASS
root-color-transition.html(0/1)0.00%FAIL
shadow-root-insertion.html(0/1)0.00%FAIL
starting-of-transitions-001.html(1/1)100.00%PASS
starting-style-adjustment.html(0/1)0.00%FAIL
starting-style-cascade.html(0/6)0.00%FAIL
starting-style-first-letter-crash.html(1/1)100.00%PASS
starting-style-name-defining-rules.html(0/2)0.00%FAIL
starting-style-rule-basic.html(0/3)0.00%FAIL
starting-style-rule-none.html(0/1)0.00%FAIL
starting-style-rule-pseudo-elements.html(0/3)0.00%FAIL
starting-style-size-container.html(0/2)0.00%FAIL
top-layer-image-transition-crash.html(1/1)100.00%PASS
transition-001.html(13/13)100.00%PASS
transition-after-animation-001.html(0/1)0.00%SKIP
transition-background-position-with-edge-offset.html(1/1)100.00%PASS
transition-base-response-001.html(3/3)100.00%PASS
transition-base-response-002.html(1/1)100.00%PASS
transition-base-response-003.html(1/1)100.00%PASS
transition-behavior-events.html(0/2)0.00%FAIL
transition-behavior.html(0/6)0.00%FAIL
transition-cancel-elapsed-time-on-removal.html(0/1)0.00%FAIL
transition-delay-001.html(21/21)100.00%PASS
transition-duration-001.html(21/21)100.00%PASS
transition-duration-infinite-cancelation.html(1/1)100.00%PASS
transition-duration-shorthand.html(1/1)100.00%PASS
transition-events-with-document-change.html(0/1)0.00%FAIL
transition-important.html(1/1)100.00%PASS
transition-in-iframe-001.html(0/1)0.00%SKIP
transition-property-001.html(5/5)100.00%PASS
transition-property-002.html(7/7)100.00%PASS
transition-remove-and-change-immediate.html(0/1)0.00%SKIP
transition-reparented.html(0/1)0.00%FAIL
transition-test.html(1/1)100.00%PASS
transition-zero-duration-with-delay.html(0/1)0.00%SKIP
transitioncancel-001.html(0/1)0.00%SKIP
transitioncancel-002.html(0/1)0.00%SKIP
transitioncancel-003.html(0/1)0.00%SKIP
transitionevent-interface.html(0/42)0.00%FAIL
transitions-retarget.html(0/1)0.00%FAIL
unregistered-custom-property-transition.html(0/3)0.00%FAIL
zero-duration-multiple-transition.html(0/1)0.00%FAIL