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Status

This page documents the implementation status of various HTML and CSS features in Blitz.

CSS PropertiesHTML ElementsEventsWPT Tests

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

Note: As it does not have a JavaScript engine, Blitz can only run about 20% of the total subtests. In the numbers below, tests that Blitz can't run are ignored and percentages are relative to the number of tests run.

Data from commit:
1093b86 wpt: skip non-UTF-8 test files instead of crashing (#659) (2026-08-09)

wpt / css / css-animations

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total50.00%(22/44)50.00%(22/44)50.00%
crashtests100.00%(10/10)100.00%(10/10)100.00%
parsing0.00%(0/1)0.00%(0/1)0.00%
TestSubtestsSubtest %Status
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
animation-delay-008.html(0/1)0.00%FAIL
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-002.html(0/1)0.00%FAIL
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-offscreen-to-onscreen.html(1/1)100.00%PASS
animation-opacity-pause-and-set-time.html(0/1)0.00%FAIL
animation-pseudo-dynamic-001.html(0/1)0.00%FAIL
animation-transform-pause-and-set-time.html(0/1)0.00%FAIL
cancel-animation-shadow-slot-invalidation.html(0/1)0.00%FAIL
display-none-to-display-block.html(0/1)0.00%FAIL
flip-running-animation-via-variable.html(0/1)0.00%FAIL
inheritance-pseudo-element.html(0/1)0.00%FAIL
jump-start-animation-before-phase.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
svg-transform-animation.html(0/1)0.00%FAIL
svg-use-transform-keyframes-custom-property-override.html(0/1)0.00%FAIL
transform-animation-under-large-scale.html(1/1)100.00%PASS
translation-animation-on-important-property.html(1/1)100.00%PASS
translation-animation-subpixel-offset.html(0/1)0.00%FAIL