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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 / text / reftests

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

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

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total86.50%(58/67)86.57%(58/67)86.57%
TestSubtestsSubtest %Status
dominant-baseline-central-large-font-size.svg(1/1)100.00%PASS
dominant-baseline-hanging-small-font-size.svg(0/1)0.00%FAIL
dominant-baseline-text-after-edge.svg(0/1)0.00%FAIL
dominant-baseline-text-before-edge.svg(0/1)0.00%FAIL
first-letter.svg(1/1)100.00%PASS
font-size-scaling.html(1/1)100.00%PASS
gradient-after-reposition.html(1/1)100.00%PASS
lang-attribute-dynamic.svg(1/1)100.00%PASS
lang-attribute.svg(0/1)0.00%FAIL
lengthAdjust-large-font-vertical.svg(1/1)100.00%PASS
lengthAdjust-large-font.svg(0/1)0.00%FAIL
lengthAdjust-vertical.svg(1/1)100.00%PASS
multiple-textpaths.svg(1/1)100.00%PASS
no-background.svg(1/1)100.00%PASS
no-margin-border-padding.svg(1/1)100.00%PASS
opacity.svg(1/1)100.00%PASS
rtl-text-path.html(1/1)100.00%PASS
text-bidi-controls-anchors-1.svg(1/1)100.00%PASS
text-bidi-controls-anchors-2.svg(1/1)100.00%PASS
text-clipped-offscreen-move-onscreen.html(1/1)100.00%PASS
text-complex-001.svg(1/1)100.00%PASS
text-complex-002.svg(1/1)100.00%PASS
text-context-fill.svg(1/1)100.00%PASS
text-display-contents-crash.html(1/1)100.00%PASS
text-font-face-load-image.html(1/1)100.00%PASS
text-huge-font-size-crash.html(1/1)100.00%PASS
text-inline-size-001.svg(1/1)100.00%PASS
text-inline-size-002.svg(1/1)100.00%PASS
text-inline-size-003.svg(1/1)100.00%PASS
text-inline-size-005.svg(1/1)100.00%PASS
text-inline-size-006.svg(1/1)100.00%PASS
text-inline-size-007.svg(1/1)100.00%PASS
text-inline-size-101.svg(1/1)100.00%PASS
text-inline-size-201.svg(1/1)100.00%PASS
text-multiline-001.svg(1/1)100.00%PASS
text-multiline-002.svg(1/1)100.00%PASS
text-multiline-003.svg(1/1)100.00%PASS
text-path-transformed-002.html(0/1)0.00%FAIL
text-path-transformed.html(0/1)0.00%FAIL
text-shape-inside-001.svg(1/1)100.00%PASS
text-shape-inside-002.svg(1/1)100.00%PASS
text-transform-001.html(1/1)100.00%PASS
text-transform-002.html(1/1)100.00%PASS
text-xml-space-001.svg(1/1)100.00%PASS
textLength-list-x-spacingAndGlyphs.svg(1/1)100.00%PASS
textLength-list-y-spacing.svg(1/1)100.00%PASS
textLength-list-y-spacingAndGlyphs.svg(1/1)100.00%PASS
textpath-combining-marks.html(1/1)100.00%PASS
textpath-letter-spacing-01.svg(1/1)100.00%PASS
textpath-path-attr-empty-fallback.svg(1/1)100.00%PASS
textpath-path-attr-invalid-path-fallback.svg(1/1)100.00%PASS
textpath-path-attr-precedence-over-href.svg(1/1)100.00%PASS
textpath-path-attr-use-up-to-first-error.svg(1/1)100.00%PASS
textpath-path-attr.svg(1/1)100.00%PASS
textpath-pathlength-css-display-none.tentative.svg(1/1)100.00%PASS
textpath-shape-001.svg(1/1)100.00%PASS
textpath-side-001.svg(1/1)100.00%PASS
textpath-side-002.svg(1/1)100.00%PASS
textpath-side-003.svg(1/1)100.00%PASS
textpath-side-004.svg(1/1)100.00%PASS
textpath-side-005.svg(1/1)100.00%PASS
transform-dynamic-change-root.html(1/1)100.00%PASS
transform-dynamic-change.html(0/1)0.00%FAIL
tspan-opacity-mixed-direction.svg(1/1)100.00%PASS
writing-mode-dynamic-change.html(1/1)100.00%PASS
xml-lang-attribute-dynamic.svg(1/1)100.00%PASS
xml-lang-attribute.svg(0/1)0.00%FAIL