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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-backgrounds / 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-backgrounds/animations

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

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total54.60%(26/78)33.33%(3630/5174)70.16%
invalidation25.00%(1/4)25.00%(1/4)25.00%
TestSubtestsSubtest %Status
background-color-animation-backdrop-infinite-duration-crash.html(1/1)100.00%PASS
background-color-animation-custom-property.html(0/1)0.00%FAIL
background-color-animation-custom-timing-function-reverse.html(1/1)100.00%PASS
background-color-animation-custom-timing-function.html(1/1)100.00%PASS
background-color-animation-element-not-visible-at-current-viewport.html(1/1)100.00%PASS
background-color-animation-fallback-additive-keyframe.html(0/1)0.00%FAIL
background-color-animation-fallback-missing-0-percent.html(0/1)0.00%FAIL
background-color-animation-fallback-missing-100-percent.html(0/1)0.00%FAIL
background-color-animation-fallback-replace.html(0/1)0.00%FAIL
background-color-animation-field-crash.html(1/1)100.00%PASS
background-color-animation-fragmented.html(1/1)100.00%PASS
background-color-animation-half-opaque.html(1/1)100.00%PASS
background-color-animation-in-body.html(1/1)100.00%PASS
background-color-animation-non-empty-no-draw-crash.html(1/1)100.00%PASS
background-color-animation-non-zero-size-element-change-to-zero.html(1/1)100.00%PASS
background-color-animation-offset-position-not-stuck.html(0/1)0.00%FAIL
background-color-animation-pseudo-element.html(0/1)0.00%FAIL
background-color-animation-removed-element-crash.html(1/1)100.00%PASS
background-color-animation-single-keyframe.html(0/1)0.00%FAIL
background-color-animation-three-keyframes1.html(0/1)0.00%FAIL
background-color-animation-three-keyframes2.html(0/1)0.00%FAIL
background-color-animation-three-keyframes3.html(0/1)0.00%FAIL
background-color-animation-will-change-contents.html(0/1)0.00%FAIL
background-color-animation-with-blur.html(0/1)0.00%FAIL
background-color-animation-with-images.html(1/1)100.00%PASS
background-color-animation-with-mask.html(1/1)100.00%PASS
background-color-animation-with-table1.html(1/1)100.00%PASS
background-color-animation-with-table2.html(1/1)100.00%PASS
background-color-animation-with-table3.html(1/1)100.00%PASS
background-color-animation-with-table4.html(1/1)100.00%PASS
background-color-animation-with-zero-playbackRate.html(0/1)0.00%FAIL
background-color-animation-zero-size-element-change-to-non-zero.html(1/1)100.00%PASS
background-color-animation-zero-size-element.html(1/1)100.00%PASS
background-color-animation.html(0/1)0.00%FAIL
background-color-interpolation.html(126/172)73.26%FAIL
background-color-scroll-into-viewport.html(1/1)100.00%PASS
background-color-transition-colormix.html(0/1)0.00%FAIL
background-color-transition-currentcolor.html(0/1)0.00%FAIL
background-color-transition.html(0/1)0.00%FAIL
background-color-transparent-animation-in-body.html(1/1)100.00%PASS
background-image-interpolation.html(132/288)45.83%FAIL
background-position-composition.html(35/70)50.00%FAIL
background-position-interpolation.html(147/196)75.00%FAIL
background-position-origin-interpolation.html(210/280)75.00%FAIL
background-position-x-interpolation.html(84/112)75.00%FAIL
background-position-y-interpolation.html(84/112)75.00%FAIL
background-size-composition.html(38/84)45.24%FAIL
background-size-interpolation.html(271/364)74.45%FAIL
border-bottom-left-radius-composition.html(21/42)50.00%FAIL
border-bottom-right-radius-composition.html(21/42)50.00%FAIL
border-bottom-width-composition.html(40/40)100.00%PASS
border-color-interpolation.html(90/144)62.50%FAIL
border-image-outset-composition.html(56/112)50.00%FAIL
border-image-outset-interpolation.html(126/168)75.00%FAIL
border-image-slice-composition.html(56/112)50.00%FAIL
border-image-slice-interpolation-stability.html(0/1)0.00%FAIL
border-image-slice-interpolation.html(343/434)79.03%FAIL
border-image-source-interpolation.html(245/294)83.33%FAIL
border-image-width-composition.html(56/112)50.00%FAIL
border-image-width-interpolation.html(443/558)79.39%FAIL
border-left-width-composition.html(40/40)100.00%PASS
border-radius-interpolation.html(147/196)75.00%FAIL
border-right-width-composition.html(40/40)100.00%PASS
border-top-left-radius-composition.html(21/42)50.00%FAIL
border-top-right-radius-composition.html(21/42)50.00%FAIL
border-top-width-composition.html(40/40)100.00%PASS
border-width-interpolation.html(192/256)75.00%FAIL
border-width-transition-with-style-change.html(0/1)0.00%FAIL
box-shadow-composition.html(40/80)50.00%FAIL
box-shadow-interpolation.html(233/402)57.96%FAIL
discrete-no-interpolation.html(210/252)83.33%FAIL
two-background-color-animation-diff-length1.html(0/1)0.00%FAIL
two-background-color-animation-diff-length2.html(0/1)0.00%FAIL
two-background-color-animation-diff-length3.html(0/1)0.00%FAIL