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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.

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.

wpt / svg / linking / reftests

Score history
1 month3 months6 months1 yearAll time
0%20%40%60%80%100%svg/linking/reftests

Data from commit:
a50cb89 wpt: run reference-named files which are themselves tests (#836) (2026-09-03)

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total31.10%(14/45)31.11%(14/45)31.11%
TestSubtestsSubtest %Status
href-a-element-attr-change.html(0/1)0.00%FAIL
href-feImage-element.html(0/1)0.00%FAIL
href-filter-element.html(0/1)0.00%FAIL
href-gradient-element.html(0/1)0.00%FAIL
href-image-element.html(1/1)100.00%PASS
href-pattern-element.html(0/1)0.00%FAIL
href-textPath-element.html(1/1)100.00%PASS
href-use-element.html(1/1)100.00%PASS
media-fragment-override-multiple.html(0/1)0.00%FAIL
media-fragment-spatial-decimal-values.html(1/1)100.00%PASS
media-fragment-spatial-img-element.html(0/1)0.00%FAIL
media-fragment-spatial-invalid-negative-width.html(1/1)100.00%PASS
media-fragment-spatial-invalid-zero-height.html(1/1)100.00%PASS
media-fragment-spatial-invalid-zero-width.html(1/1)100.00%PASS
media-fragment-spatial-last-wins.html(0/1)0.00%FAIL
media-fragment-spatial-overflow-clamped-nonzero-origin.html(0/1)0.00%FAIL
media-fragment-spatial-overflow-clamped.html(1/1)100.00%PASS
media-fragment-spatial-percent-full.html(1/1)100.00%PASS
media-fragment-spatial-percent-img-element.html(0/1)0.00%FAIL
media-fragment-spatial-percent-no-natural-size.html(0/1)0.00%FAIL
media-fragment-spatial-percent-nonsquare.html(0/1)0.00%FAIL
media-fragment-spatial-percent-viewbox-no-size.html(0/1)0.00%FAIL
media-fragment-spatial-percent-zero-size.html(1/1)100.00%PASS
media-fragment-spatial-percent.html(0/1)0.00%FAIL
media-fragment-spatial-pixel-explicit.html(0/1)0.00%FAIL
media-fragment-spatial-pixel-implicit.html(0/1)0.00%FAIL
media-fragment-spatial-viewbox-only.html(0/1)0.00%FAIL
media-fragment-spatial-viewbox-width.html(0/1)0.00%FAIL
svgview-and-xywh.html(1/1)100.00%PASS
svgview-viewbox-override-multiple.html(0/1)0.00%FAIL
url-processing-fetch-properties-001.sub.svg(0/1)0.00%FAIL
url-processing-fetch-properties-002.sub.svg(0/1)0.00%FAIL
url-processing-whitespace-001.svg(0/1)0.00%FAIL
url-processing-whitespace-002.svg(0/1)0.00%FAIL
url-processing-whitespace-003.svg(0/1)0.00%FAIL
url-reference-local-textpath.svg(0/1)0.00%FAIL
use-descendant-combinator-001.html(1/1)100.00%PASS
use-descendant-combinator-002.html(0/1)0.00%FAIL
use-descendant-combinator-003.html(0/1)0.00%FAIL
use-hidden-attr-change.html(0/1)0.00%FAIL
use-keyframes.html(0/1)0.00%FAIL
use-nested-symbol-001.html(1/1)100.00%PASS
use-symbol-rendered-001.html(1/1)100.00%PASS
use-template.html(0/1)0.00%FAIL
view-viewbox-override.html(0/1)0.00%FAIL