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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 / css / css-backgrounds / parsing

Score history
1 month3 months6 months1 yearAll time
0%20%40%60%80%100%Sep 2026css/css-backgrounds/parsing

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

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total91.70%(57/74)77.03%(824/916)89.96%
TestSubtestsSubtest %Status
background-attachment-computed.html(3/5)60.00%FAIL
background-attachment-invalid.html(2/2)100.00%PASS
background-attachment-valid.html(1/2)50.00%FAIL
background-clip-computed.html(6/11)54.55%FAIL
background-clip-invalid.html(5/5)100.00%PASS
background-clip-valid.html(3/9)33.33%FAIL
background-color-computed.html(7/7)100.00%PASS
background-color-invalid.html(3/3)100.00%PASS
background-color-valid.html(9/9)100.00%PASS
background-computed.html(31/39)79.49%FAIL
background-image-computed.sub.html(47/48)97.92%FAIL
background-image-invalid.html(12/12)100.00%PASS
background-image-valid.html(3/13)23.08%FAIL
background-invalid.html(2/2)100.00%PASS
background-origin-computed.html(7/7)100.00%PASS
background-origin-invalid.html(4/4)100.00%PASS
background-origin-valid.html(4/4)100.00%PASS
background-position-computed.html(32/32)100.00%PASS
background-position-invalid.html(11/11)100.00%PASS
background-position-valid.html(31/31)100.00%PASS
background-position-x-computed.html(16/19)84.21%FAIL
background-position-x-invalid.html(9/9)100.00%PASS
background-position-x-valid.html(12/15)80.00%FAIL
background-position-y-computed.html(16/19)84.21%FAIL
background-position-y-invalid.html(9/9)100.00%PASS
background-position-y-valid.html(12/15)80.00%FAIL
background-repeat-computed.html(13/13)100.00%PASS
background-repeat-invalid.html(3/3)100.00%PASS
background-repeat-valid.html(4/4)100.00%PASS
background-shorthand-serialization.html(0/11)0.00%FAIL
background-size-computed.html(16/16)100.00%PASS
background-size-invalid.html(3/3)100.00%PASS
background-size-valid.html(9/9)100.00%PASS
background-valid.html(17/46)36.96%FAIL
border-color-computed.html(8/8)100.00%PASS
border-color-invalid.html(3/3)100.00%PASS
border-color-shorthand.html(20/20)100.00%PASS
border-color-valid.html(7/7)100.00%PASS
border-image-invalid.html(17/17)100.00%PASS
border-image-outset-computed.html(5/7)71.43%FAIL
border-image-outset-invalid.html(5/5)100.00%PASS
border-image-outset-valid.html(3/3)100.00%PASS
border-image-repeat-computed.html(3/3)100.00%PASS
border-image-repeat-invalid.html(2/2)100.00%PASS
border-image-repeat-valid.html(3/3)100.00%PASS
border-image-shorthand.sub.html(30/30)100.00%PASS
border-image-slice-computed.html(5/7)71.43%FAIL
border-image-slice-invalid.html(6/6)100.00%PASS
border-image-slice-valid.html(4/4)100.00%PASS
border-image-source-computed.sub.html(9/10)90.00%FAIL
border-image-source-invalid.html(2/2)100.00%PASS
border-image-source-valid.html(2/2)100.00%PASS
border-image-valid.html(30/30)100.00%PASS
border-image-width-computed.html(12/12)100.00%PASS
border-image-width-invalid.html(5/5)100.00%PASS
border-image-width-valid.html(5/5)100.00%PASS
border-invalid.html(3/3)100.00%PASS
border-radius-computed.html(14/14)100.00%PASS
border-radius-invalid.html(11/11)100.00%PASS
border-radius-valid.html(23/23)100.00%PASS
border-shorthand.html(36/36)100.00%PASS
border-style-computed.html(8/8)100.00%PASS
border-style-invalid.html(2/2)100.00%PASS
border-style-shorthand.html(20/20)100.00%PASS
border-style-valid.html(8/8)100.00%PASS
border-valid.html(6/6)100.00%PASS
border-width-computed.html(11/11)100.00%PASS
border-width-invalid.html(3/3)100.00%PASS
border-width-shorthand.html(20/20)100.00%PASS
border-width-valid.html(6/6)100.00%PASS
box-shadow-computed.html(4/4)100.00%PASS
box-shadow-invalid.html(40/40)100.00%PASS
box-shadow-valid.html(38/38)100.00%PASS
webkit-border-radius-valid.html(23/25)92.00%FAIL