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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 / css-page

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total38.10%(85/223)38.12%(85/223)38.12%
crashtests100.00%(3/3)100.00%(3/3)100.00%
cssom0.00%(0/1)0.00%(0/1)0.00%
margin-boxes2.60%(1/38)2.63%(1/38)2.63%
tentative0.00%(0/3)0.00%(0/3)0.00%
TestSubtestsSubtest %Status
background-image-only-for-print.html(0/1)0.00%FAIL
basic-pagination-001-print.html(1/1)100.00%PASS
basic-pagination-002-print.html(0/1)0.00%FAIL
basic-pagination-003-print.html(0/1)0.00%FAIL
body-background-slr-print.html(0/1)0.00%FAIL
body-background-srl-print.html(0/1)0.00%FAIL
body-background-vlr-print.html(0/1)0.00%FAIL
body-background-vrl-print.html(0/1)0.00%FAIL
fixedpos-001-print.html(0/1)0.00%FAIL
fixedpos-002-print.html(0/1)0.00%FAIL
fixedpos-003-print.html(0/1)0.00%FAIL
fixedpos-004-print.html(0/1)0.00%FAIL
fixedpos-005-print.html(0/1)0.00%FAIL
fixedpos-006-print.html(0/1)0.00%FAIL
fixedpos-007-print.html(0/1)0.00%FAIL
fixedpos-008-print.html(0/1)0.00%FAIL
fixedpos-009-print.html(0/1)0.00%FAIL
fixedpos-010-print.html(0/1)0.00%FAIL
fixedpos-011-print.html(0/1)0.00%FAIL
fixedpos-with-abspos-with-link-print.html(0/1)0.00%FAIL
fixedpos-with-iframe-print.html(0/1)0.00%FAIL
fixedpos-with-link-with-inline-child-print.html(0/1)0.00%FAIL
layers-001-print.html(1/1)100.00%PASS
layers-002-print.html(0/1)0.00%FAIL
layers-003-print.html(0/1)0.00%FAIL
layers-004-print.html(0/1)0.00%FAIL
media-queries-001-print.html(0/1)0.00%FAIL
media-queries-002-print.html(0/1)0.00%FAIL
media-queries-003-print.html(0/1)0.00%FAIL
monolithic-overflow-001-print.html(1/1)100.00%PASS
monolithic-overflow-002-print.html(1/1)100.00%PASS
monolithic-overflow-003-print.html(1/1)100.00%PASS
monolithic-overflow-004-print.html(1/1)100.00%PASS
monolithic-overflow-005-print.html(1/1)100.00%PASS
monolithic-overflow-006-print.html(1/1)100.00%PASS
monolithic-overflow-007-print.html(1/1)100.00%PASS
monolithic-overflow-008-print.html(1/1)100.00%PASS
monolithic-overflow-009-print.html(0/1)0.00%FAIL
monolithic-overflow-010-print.html(0/1)0.00%FAIL
monolithic-overflow-011-print.html(0/1)0.00%FAIL
monolithic-overflow-012-print.html(1/1)100.00%PASS
monolithic-overflow-013-print.html(1/1)100.00%PASS
monolithic-overflow-014-print.html(0/1)0.00%FAIL
monolithic-overflow-015-print.html(1/1)100.00%PASS
monolithic-overflow-016-print.html(0/1)0.00%FAIL
monolithic-overflow-017-print.html(0/1)0.00%FAIL
monolithic-overflow-018-print.html(1/1)100.00%PASS
monolithic-overflow-019-print.html(1/1)100.00%PASS
monolithic-overflow-020-print.html(1/1)100.00%PASS
monolithic-overflow-021-print.html(1/1)100.00%PASS
monolithic-overflow-022-print.html(1/1)100.00%PASS
monolithic-overflow-023-print.html(0/1)0.00%FAIL
monolithic-overflow-024-print.html(0/1)0.00%FAIL
monolithic-overflow-025-print.html(0/1)0.00%FAIL
monolithic-overflow-026-print.html(1/1)100.00%PASS
monolithic-overflow-027-print.html(1/1)100.00%PASS
monolithic-overflow-028-print.html(1/1)100.00%PASS
monolithic-overflow-029-print.html(1/1)100.00%PASS
monolithic-overflow-030-print.html(0/1)0.00%FAIL
monolithic-overflow-031-print.html(0/1)0.00%FAIL
monolithic-overflow-032-print.tentative.html(1/1)100.00%PASS
page-background-001-print.html(0/1)0.00%FAIL
page-background-002-print.html(0/1)0.00%FAIL
page-background-003-print.html(0/1)0.00%FAIL
page-background-004-print.html(0/1)0.00%FAIL
page-background-005-print.html(0/1)0.00%FAIL
page-background-image-print.html(0/1)0.00%FAIL
page-box-000-print.html(0/1)0.00%FAIL
page-box-001-print.html(0/1)0.00%FAIL
page-box-002-print.html(0/1)0.00%FAIL
page-box-003-print.html(0/1)0.00%FAIL
page-box-004-print.html(0/1)0.00%FAIL
page-box-005-print.html(0/1)0.00%FAIL
page-box-006-print.html(0/1)0.00%FAIL
page-box-007-print.html(0/1)0.00%FAIL
page-box-008-print.html(0/1)0.00%FAIL
page-box-009-print.html(0/1)0.00%FAIL
page-box-010-print.html(0/1)0.00%FAIL
page-box-011-print.html(0/1)0.00%FAIL
page-left-right-001-print.html(0/1)0.00%FAIL
page-left-right-002-print.html(0/1)0.00%FAIL
page-margin-001-print.html(0/1)0.00%FAIL
page-margin-002-print.html(0/1)0.00%FAIL
page-margin-003-print.html(0/1)0.00%FAIL
page-margin-004-print.html(0/1)0.00%FAIL
page-margin-005-print.html(1/1)100.00%PASS
page-margin-006-print.html(1/1)100.00%PASS
page-margin-007-print.html(0/1)0.00%FAIL
page-margin-auto-and-non-zero-print.html(0/1)0.00%FAIL
page-margin-auto-negative-print.tentative.html(0/1)0.00%FAIL
page-margin-auto-print.html(0/1)0.00%FAIL
page-margin-negative-print.tentative.html(0/1)0.00%FAIL
page-name-000-print.html(1/1)100.00%PASS
page-name-001-print.html(1/1)100.00%PASS
page-name-002-print.html(0/1)0.00%FAIL
page-name-003-print.html(1/1)100.00%PASS
page-name-abspos-001-print.html(1/1)100.00%PASS
page-name-abspos-002-print.html(1/1)100.00%PASS
page-name-abspos-003-print.html(1/1)100.00%PASS
page-name-and-break-001-print.html(1/1)100.00%PASS
page-name-and-break-002-print.html(1/1)100.00%PASS
page-name-and-break-003-print.html(1/1)100.00%PASS
page-name-and-break-004-print.html(1/1)100.00%PASS
page-name-canvas-001-print.html(1/1)100.00%PASS
page-name-canvas-002-print.html(1/1)100.00%PASS
page-name-canvas-003-print.html(1/1)100.00%PASS
page-name-canvas-004-print.html(1/1)100.00%PASS
page-name-display-none-child-print.html(1/1)100.00%PASS
page-name-fixed-pos-001-print.html(1/1)100.00%PASS
page-name-flex-001-print.html(1/1)100.00%PASS
page-name-flex-002-print.html(1/1)100.00%PASS
page-name-flex-003-print.html(1/1)100.00%PASS
page-name-flex-004-print.html(1/1)100.00%PASS
page-name-float-001-print.html(1/1)100.00%PASS
page-name-float-002-print.html(1/1)100.00%PASS
page-name-img-001-print.html(1/1)100.00%PASS
page-name-img-002-print.html(1/1)100.00%PASS
page-name-img-003-print.html(1/1)100.00%PASS
page-name-img-004-print.html(1/1)100.00%PASS
page-name-inline-block-001-print.html(1/1)100.00%PASS
page-name-inline-block-002-print.html(1/1)100.00%PASS
page-name-inline-block-003-print.html(1/1)100.00%PASS
page-name-margin-001-print.html(0/1)0.00%FAIL
page-name-margin-002-print.html(0/1)0.00%FAIL
page-name-orthogonal-writing-001-print.html(1/1)100.00%PASS
page-name-orthogonal-writing-002-print.html(0/1)0.00%FAIL
page-name-orthogonal-writing-003-print.html(1/1)100.00%PASS
page-name-orthogonal-writing-004-print.html(1/1)100.00%PASS
page-name-propagated-001-print.html(1/1)100.00%PASS
page-name-propagated-002-print.html(1/1)100.00%PASS
page-name-propagated-003-print.html(1/1)100.00%PASS
page-name-propagated-004-print.html(1/1)100.00%PASS
page-name-propagated-005-print.html(1/1)100.00%PASS
page-name-propagated-006-print.html(1/1)100.00%PASS
page-name-propagated-007-print.html(1/1)100.00%PASS
page-name-propagated-008-print.html(1/1)100.00%PASS
page-name-propagated-009-print.html(1/1)100.00%PASS
page-name-siblings-001-print.html(1/1)100.00%PASS
page-name-siblings-002-print.html(1/1)100.00%PASS
page-name-siblings-003-print.html(1/1)100.00%PASS
page-name-siblings-004-print.html(1/1)100.00%PASS
page-name-siblings-005-print.html(1/1)100.00%PASS
page-name-table-001-print.html(1/1)100.00%PASS
page-name-unnamed-trailing-001-print.html(1/1)100.00%PASS
page-name-zero-height-001-print.html(1/1)100.00%PASS
page-orientation-on-landscape-001-print.html(0/1)0.00%FAIL
page-orientation-on-portrait-001-print.html(0/1)0.00%FAIL
page-orientation-on-square-001-print.html(0/1)0.00%FAIL
page-rule-specificity-001-print.html(0/1)0.00%FAIL
page-rule-specificity-002-print.html(0/1)0.00%FAIL
page-rule-specificity-003-print.html(0/1)0.00%FAIL
page-size-001-print.html(0/1)0.00%FAIL
page-size-002-print.html(0/1)0.00%FAIL
page-size-003-print.html(0/1)0.00%FAIL
page-size-004-print.html(0/1)0.00%FAIL
page-size-005-print.html(0/1)0.00%FAIL
page-size-006-print.html(0/1)0.00%FAIL
page-size-007-print.html(0/1)0.00%FAIL
page-size-008-print.html(0/1)0.00%FAIL
page-size-009-print.html(0/1)0.00%FAIL
page-size-010-print.html(0/1)0.00%FAIL
page-size-011-print.html(1/1)100.00%PASS
page-size-012-print.html(0/1)0.00%FAIL
page-size-013-print.html(1/1)100.00%PASS
page-size-014-print.html(1/1)100.00%PASS
page-size-015-print.tentative.html(1/1)100.00%PASS
page-size-016-print.tentative.html(0/1)0.00%FAIL
page-size-017-print.tentative.html(0/1)0.00%FAIL
page-visibility-hidden-001-print.html(1/1)100.00%PASS
pseudo-first-margin-001-print.html(0/1)0.00%FAIL
pseudo-first-margin-002-print.html(0/1)0.00%FAIL
pseudo-first-margin-003-print.html(0/1)0.00%FAIL
pseudo-first-margin-004-print.html(0/1)0.00%FAIL
remote-origin-iframe-print.html(0/1)0.00%FAIL
root-element-display-none-print.html(1/1)100.00%PASS
subpixel-page-size-001-print.html(0/1)0.00%FAIL
subpixel-page-size-002-print.html(0/1)0.00%FAIL
trailing-declaration-crash.html(1/1)100.00%PASS