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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:
708eb61 WPT runner: support mismatch reftests and multiple rel=match links (#665) (2026-08-09)

wpt / css / css-grid / subgrid

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total35.40%(41/117)35.04%(42/190)22.11%
crashtests100.00%(9/9)100.00%(9/9)100.00%
TestSubtestsSubtest %Status
abs-pos-001.html(0/1)0.00%FAIL
abs-pos-002.html(0/1)0.00%FAIL
align-self-baseline-with-subgrid-mbp.html(0/2)0.00%FAIL
alignment-in-subgridded-axes-001.html(0/16)0.00%FAIL
alignment-in-subgridded-axes-002.html(1/1)100.00%PASS
auto-track-sizing-001.html(1/1)100.00%PASS
auto-track-sizing-002.html(1/1)100.00%PASS
auto-track-sizing-003.html(1/1)100.00%PASS
auto-track-sizing-004.html(0/1)0.00%FAIL
baseline-001.html(0/1)0.00%FAIL
contribution-size-flex-tracks-001.html(0/1)0.00%FAIL
dynamic-min-content-001.html(0/1)0.00%FAIL
dynamic-min-content-002.html(0/1)0.00%FAIL
dynamic-min-content-003.html(0/1)0.00%FAIL
dynamic-subgridded-item-height.html(0/1)0.00%FAIL
grid-gap-001.html(0/1)0.00%FAIL
grid-gap-002.html(0/1)0.00%FAIL
grid-gap-003.html(0/1)0.00%FAIL
grid-gap-004.html(0/1)0.00%FAIL
grid-gap-005.html(0/1)0.00%FAIL
grid-gap-006.html(0/1)0.00%FAIL
grid-gap-007.html(0/1)0.00%FAIL
grid-gap-008.html(0/1)0.00%FAIL
grid-gap-009.html(0/1)0.00%FAIL
grid-gap-010.html(0/1)0.00%FAIL
grid-gap-011.html(0/1)0.00%FAIL
grid-gap-012.html(0/1)0.00%FAIL
grid-gap-larger-001.html(0/1)0.00%FAIL
grid-gap-larger-002.html(0/1)0.00%FAIL
grid-gap-normal-001.html(0/1)0.00%FAIL
grid-gap-smaller-001.html(0/1)0.00%FAIL
independent-formatting-context-fieldset.html(0/1)0.00%FAIL
independent-formatting-context.html(0/1)0.00%FAIL
independent-tracks-from-parent-grid.html(1/1)100.00%PASS
item-percentage-height-001.html(0/1)0.00%FAIL
line-names-001.html(1/1)100.00%PASS
line-names-002.html(1/1)100.00%PASS
line-names-003.html(1/1)100.00%PASS
line-names-004.html(0/1)0.00%FAIL
line-names-005.html(0/1)0.00%FAIL
line-names-006.html(0/1)0.00%FAIL
line-names-007.html(0/1)0.00%FAIL
line-names-008.html(0/1)0.00%FAIL
line-names-009.html(0/1)0.00%FAIL
line-names-010.html(0/1)0.00%FAIL
line-names-011.html(0/1)0.00%FAIL
line-names-012.html(0/1)0.00%FAIL
line-names-013.html(1/1)100.00%PASS
line-names-014.html(1/1)100.00%PASS
line-names-015.html(1/1)100.00%PASS
orthogonal-writing-mode-001.html(0/1)0.00%FAIL
orthogonal-writing-mode-002.html(0/1)0.00%FAIL
orthogonal-writing-mode-003.html(0/1)0.00%FAIL
orthogonal-writing-mode-004.html(0/1)0.00%FAIL
orthogonal-writing-mode-005.html(1/1)100.00%PASS
orthogonal-writing-mode-006.html(1/1)100.00%PASS
overflow-hidden-does-not-prohibit-subgrid.html(0/1)0.00%FAIL
parent-repeat-auto-fit-001.html(1/1)100.00%PASS
parent-repeat-auto-fit-002.html(1/1)100.00%PASS
percentage-track-sizing.html(1/1)100.00%PASS
placement-implicit-001.html(0/1)0.00%FAIL
placement-invalidation-001.html(0/1)0.00%FAIL
repeat-auto-fill-001.html(0/1)0.00%FAIL
repeat-auto-fill-002.html(0/1)0.00%FAIL
repeat-auto-fill-003.html(0/1)0.00%FAIL
repeat-auto-fill-004.html(0/1)0.00%FAIL
repeat-auto-fill-005.html(0/1)0.00%FAIL
repeat-auto-fill-006.html(0/1)0.00%FAIL
repeat-auto-fill-007.html(1/1)100.00%PASS
repeat-auto-fill-008.html(1/1)100.00%PASS
scrollbar-gutter-001.html(1/1)100.00%PASS
scrollbar-gutter-002.html(1/1)100.00%PASS
standalone-axis-size-001.html(0/1)0.00%FAIL
standalone-axis-size-002.html(0/1)0.00%FAIL
standalone-axis-size-003.html(1/1)100.00%PASS
standalone-axis-size-004.html(1/1)100.00%PASS
standalone-axis-size-005.html(0/1)0.00%FAIL
standalone-axis-size-006.html(0/1)0.00%FAIL
standalone-axis-size-007.html(0/1)0.00%FAIL
standalone-axis-size-008.html(1/1)100.00%PASS
standalone-axis-size-009.html(1/1)100.00%PASS
standalone-axis-size-010.html(1/1)100.00%PASS
standalone-axis-size-011.html(1/1)100.00%PASS
standalone-axis-size-012.html(1/1)100.00%PASS
standalone-axis-size-013.html(1/1)100.00%PASS
sticky-subgrid-item.html(0/1)0.00%FAIL
subgrid-baseline-001.html(0/1)0.00%FAIL
subgrid-baseline-002.html(0/1)0.00%FAIL
subgrid-baseline-003.html(0/1)0.00%FAIL
subgrid-baseline-004.html(0/1)0.00%FAIL
subgrid-baseline-005.html(0/12)0.00%FAIL
subgrid-baseline-006.html(0/12)0.00%FAIL
subgrid-baseline-007.html(0/12)0.00%FAIL
subgrid-baseline-008.html(0/12)0.00%FAIL
subgrid-baseline-009.html(0/12)0.00%FAIL
subgrid-baseline-010.html(0/2)0.00%FAIL
subgrid-baseline-011.html(1/2)50.00%FAIL
subgrid-baseline-012.html(1/1)100.00%PASS
subgrid-button.html(0/1)0.00%FAIL
subgrid-item-block-size-001.html(0/1)0.00%FAIL
subgrid-item-with-margin-left-auto.html(0/1)0.00%FAIL
subgrid-no-items-on-edges-001.html(1/1)100.00%PASS
subgrid-no-items-on-edges-002.html(0/1)0.00%FAIL
subgrid-scroller-auto-height-padding.html(1/1)100.00%PASS
subgrid-stretch.html(0/1)0.00%FAIL
writing-directions-001.html(0/1)0.00%FAIL
writing-directions-002.html(1/1)100.00%PASS
writing-directions-003.html(0/1)0.00%FAIL