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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 / CSS2 / linebox

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total67.60%(131/194)67.53%(133/206)64.56%
crashtests100.00%(1/1)100.00%(1/1)100.00%
TestSubtestsSubtest %Status
anonymous-inline-inherit-001.html(1/1)100.00%PASS
baseline-block-with-overflow-001.html(1/1)100.00%PASS
border-padding-bleed-001.xht(0/1)0.00%FAIL
border-padding-bleed-002.xht(0/1)0.00%FAIL
border-padding-bleed-003.xht(0/1)0.00%FAIL
empty-inline-001.xht(1/1)100.00%PASS
empty-inline-002.xht(0/1)0.00%FAIL
empty-inline-003.xht(0/1)0.00%FAIL
fractional-line-height.html(1/1)100.00%PASS
iframe-in-block-in-inline.html(1/1)100.00%PASS
iframe-in-wrapped-span.html(1/1)100.00%PASS
inline-box-001.xht(0/1)0.00%FAIL
inline-box-002.xht(0/1)0.00%FAIL
inline-formatting-context-001.xht(1/1)100.00%PASS
inline-formatting-context-002.xht(0/1)0.00%FAIL
inline-formatting-context-003.xht(0/1)0.00%FAIL
inline-formatting-context-004.xht(0/1)0.00%FAIL
inline-formatting-context-005.xht(0/1)0.00%FAIL
inline-formatting-context-006.xht(0/1)0.00%FAIL
inline-formatting-context-007.xht(0/1)0.00%FAIL
inline-formatting-context-008.xht(1/1)100.00%PASS
inline-formatting-context-009.xht(1/1)100.00%PASS
inline-formatting-context-011.xht(0/1)0.00%FAIL
inline-formatting-context-012.xht(1/1)100.00%PASS
inline-formatting-context-013.xht(1/1)100.00%PASS
inline-formatting-context-015.xht(1/1)100.00%PASS
inline-formatting-context-022.xht(0/1)0.00%FAIL
inline-formatting-context-023.xht(0/1)0.00%FAIL
inline-negative-margin-001.html(2/13)15.38%FAIL
leading-001.xht(1/1)100.00%PASS
line-box-height-002.xht(1/1)100.00%PASS
line-breaking-font-size-zero-001.html(0/1)0.00%FAIL
line-height-002.xht(1/1)100.00%PASS
line-height-004.xht(1/1)100.00%PASS
line-height-005.xht(1/1)100.00%PASS
line-height-006.xht(1/1)100.00%PASS
line-height-007.xht(1/1)100.00%PASS
line-height-013.xht(1/1)100.00%PASS
line-height-015.xht(1/1)100.00%PASS
line-height-016.xht(1/1)100.00%PASS
line-height-017.xht(1/1)100.00%PASS
line-height-018.xht(1/1)100.00%PASS
line-height-024.xht(1/1)100.00%PASS
line-height-025.xht(1/1)100.00%PASS
line-height-026.xht(1/1)100.00%PASS
line-height-027.xht(1/1)100.00%PASS
line-height-028.xht(1/1)100.00%PASS
line-height-029.xht(1/1)100.00%PASS
line-height-035.xht(1/1)100.00%PASS
line-height-037.xht(1/1)100.00%PASS
line-height-038.xht(1/1)100.00%PASS
line-height-039.xht(1/1)100.00%PASS
line-height-040.xht(1/1)100.00%PASS
line-height-046.xht(1/1)100.00%PASS
line-height-048.xht(1/1)100.00%PASS
line-height-049.xht(1/1)100.00%PASS
line-height-050.xht(1/1)100.00%PASS
line-height-051.xht(1/1)100.00%PASS
line-height-057.xht(1/1)100.00%PASS
line-height-058.xht(1/1)100.00%PASS
line-height-059.xht(1/1)100.00%PASS
line-height-060.xht(1/1)100.00%PASS
line-height-061.xht(1/1)100.00%PASS
line-height-062.xht(1/1)100.00%PASS
line-height-068.xht(1/1)100.00%PASS
line-height-069.xht(1/1)100.00%PASS
line-height-070.xht(1/1)100.00%PASS
line-height-071.xht(1/1)100.00%PASS
line-height-072.xht(1/1)100.00%PASS
line-height-073.xht(1/1)100.00%PASS
line-height-079.xht(1/1)100.00%PASS
line-height-080.xht(1/1)100.00%PASS
line-height-081.xht(1/1)100.00%PASS
line-height-082.xht(1/1)100.00%PASS
line-height-083.xht(1/1)100.00%PASS
line-height-084.xht(1/1)100.00%PASS
line-height-090.xht(1/1)100.00%PASS
line-height-092.xht(1/1)100.00%PASS
line-height-093.xht(1/1)100.00%PASS
line-height-094.xht(1/1)100.00%PASS
line-height-095.xht(1/1)100.00%PASS
line-height-101.xht(1/1)100.00%PASS
line-height-102.xht(1/1)100.00%PASS
line-height-103.xht(1/1)100.00%PASS
line-height-104.xht(1/1)100.00%PASS
line-height-105.xht(1/1)100.00%PASS
line-height-106.xht(1/1)100.00%PASS
line-height-112.xht(1/1)100.00%PASS
line-height-121.xht(1/1)100.00%PASS
line-height-125.xht(0/1)0.00%FAIL
line-height-126.xht(1/1)100.00%PASS
line-height-127.xht(0/1)0.00%FAIL
line-height-128.xht(1/1)100.00%PASS
line-height-129.xht(1/1)100.00%PASS
line-height-applies-to-001.xht(0/1)0.00%FAIL
line-height-applies-to-002.xht(0/1)0.00%FAIL
line-height-applies-to-003.xht(0/1)0.00%FAIL
line-height-applies-to-004.xht(0/1)0.00%FAIL
line-height-applies-to-005.xht(1/1)100.00%PASS
line-height-applies-to-006.xht(1/1)100.00%PASS
line-height-applies-to-007.xht(0/1)0.00%FAIL
line-height-applies-to-008.xht(0/1)0.00%FAIL
line-height-applies-to-009.xht(0/1)0.00%FAIL
line-height-applies-to-012.xht(0/1)0.00%FAIL
line-height-applies-to-013.xht(0/1)0.00%FAIL
line-height-applies-to-014.xht(0/1)0.00%FAIL
line-height-applies-to-015.xht(0/1)0.00%FAIL
line-height-applies-to-016.xht(1/1)100.00%PASS
line-height-bleed-001.xht(1/1)100.00%PASS
line-height-bleed-002.xht(1/1)100.00%PASS
line-height-oof-descendants-001.html(1/1)100.00%PASS
soft-wrap-opportunity-after-replaced-content-crash.html(1/1)100.00%PASS
split-inline-borders.html(0/1)0.00%FAIL
vertical-align-004.xht(1/1)100.00%PASS
vertical-align-005.xht(1/1)100.00%PASS
vertical-align-006.xht(1/1)100.00%PASS
vertical-align-007.xht(0/1)0.00%FAIL
vertical-align-008.xht(0/1)0.00%FAIL
vertical-align-016.xht(1/1)100.00%PASS
vertical-align-017.xht(1/1)100.00%PASS
vertical-align-018.xht(1/1)100.00%PASS
vertical-align-019.xht(0/1)0.00%FAIL
vertical-align-020.xht(0/1)0.00%FAIL
vertical-align-028.xht(1/1)100.00%PASS
vertical-align-029.xht(1/1)100.00%PASS
vertical-align-030.xht(1/1)100.00%PASS
vertical-align-031.xht(0/1)0.00%FAIL
vertical-align-032.xht(0/1)0.00%FAIL
vertical-align-040.xht(1/1)100.00%PASS
vertical-align-041.xht(1/1)100.00%PASS
vertical-align-042.xht(1/1)100.00%PASS
vertical-align-043.xht(0/1)0.00%FAIL
vertical-align-044.xht(0/1)0.00%FAIL
vertical-align-052.xht(1/1)100.00%PASS
vertical-align-053.xht(1/1)100.00%PASS
vertical-align-054.xht(1/1)100.00%PASS
vertical-align-055.xht(0/1)0.00%FAIL
vertical-align-056.xht(0/1)0.00%FAIL
vertical-align-064.xht(1/1)100.00%PASS
vertical-align-065.xht(1/1)100.00%PASS
vertical-align-066.xht(1/1)100.00%PASS
vertical-align-067.xht(0/1)0.00%FAIL
vertical-align-068.xht(0/1)0.00%FAIL
vertical-align-076.xht(1/1)100.00%PASS
vertical-align-077.xht(1/1)100.00%PASS
vertical-align-078.xht(1/1)100.00%PASS
vertical-align-079.xht(0/1)0.00%FAIL
vertical-align-080.xht(0/1)0.00%FAIL
vertical-align-088.xht(1/1)100.00%PASS
vertical-align-089.xht(1/1)100.00%PASS
vertical-align-090.xht(1/1)100.00%PASS
vertical-align-091.xht(0/1)0.00%FAIL
vertical-align-092.xht(0/1)0.00%FAIL
vertical-align-100.xht(1/1)100.00%PASS
vertical-align-101.xht(1/1)100.00%PASS
vertical-align-102.xht(1/1)100.00%PASS
vertical-align-103.xht(0/1)0.00%FAIL
vertical-align-104.xht(0/1)0.00%FAIL
vertical-align-109.xht(1/1)100.00%PASS
vertical-align-110.xht(1/1)100.00%PASS
vertical-align-111.xht(1/1)100.00%PASS
vertical-align-117a.xht(0/1)0.00%FAIL
vertical-align-118a.xht(0/1)0.00%FAIL
vertical-align-121.xht(0/1)0.00%FAIL
vertical-align-122.xht(0/1)0.00%FAIL
vertical-align-applies-to-001.xht(1/1)100.00%PASS
vertical-align-applies-to-002.xht(1/1)100.00%PASS
vertical-align-applies-to-003.xht(1/1)100.00%PASS
vertical-align-applies-to-004.xht(1/1)100.00%PASS
vertical-align-applies-to-005.xht(1/1)100.00%PASS
vertical-align-applies-to-006.xht(1/1)100.00%PASS
vertical-align-applies-to-007.xht(0/1)0.00%FAIL
vertical-align-applies-to-008.xht(0/1)0.00%FAIL
vertical-align-applies-to-009.xht(1/1)100.00%PASS
vertical-align-applies-to-012.xht(1/1)100.00%PASS
vertical-align-applies-to-013.xht(1/1)100.00%PASS
vertical-align-applies-to-014.xht(1/1)100.00%PASS
vertical-align-applies-to-015.xht(0/1)0.00%FAIL
vertical-align-baseline-001.xht(1/1)100.00%PASS
vertical-align-baseline-002.xht(1/1)100.00%PASS
vertical-align-baseline-003.xht(0/1)0.00%FAIL
vertical-align-baseline-004a.xht(0/1)0.00%FAIL
vertical-align-baseline-005a.xht(0/1)0.00%FAIL
vertical-align-baseline-006.xht(0/1)0.00%FAIL
vertical-align-baseline-007.xht(1/1)100.00%PASS
vertical-align-baseline-008.xht(1/1)100.00%PASS
vertical-align-baseline-009.xht(0/1)0.00%FAIL
vertical-align-baseline-010.xht(1/1)100.00%PASS
vertical-align-negative-leading-001.html(0/1)0.00%FAIL
vertical-align-nested-top-001.html(1/1)100.00%PASS
vertical-align-sub-001.xht(1/1)100.00%PASS
vertical-align-super-001.xht(1/1)100.00%PASS
vertical-align-top-bottom-padding.html(1/1)100.00%PASS