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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.

wpt / css / css-contain

Score history
1 month3 months6 months1 year2 years4 yearsAll time
0%20%40%60%80%100%May 2025Jul 2025Sep 2025Nov 2025Jan 2026Mar 2026May 2026Jul 2026Sep 2026css/css-contain

Data from commit:
ab0e30b Give form controls a UA default font-family (#940) (2026-09-25)

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total53.67%(307/586)52.39%(452/985)45.89%
content-visibility50.50%(119/240)49.58%(146/458)31.88%
parsing93.08%(2/4)50.00%(39/43)90.70%
crashtests100.00%(9/9)100.00%(9/9)100.00%
TestSubtestsSubtest %Status
contain-animation-001.html(0/1)0.00%FAIL
contain-body-bg-001.html(0/1)0.00%FAIL
contain-body-bg-002.html(0/1)0.00%FAIL
contain-body-bg-003.html(0/1)0.00%FAIL
contain-body-bg-004.html(0/1)0.00%FAIL
contain-body-dir-001.html(1/1)100.00%PASS
contain-body-dir-002.html(1/1)100.00%PASS
contain-body-dir-003.html(1/1)100.00%PASS
contain-body-dir-004.html(1/1)100.00%PASS
contain-body-overflow-001.html(1/1)100.00%PASS
contain-body-overflow-002.html(0/1)0.00%FAIL
contain-body-overflow-003.html(1/1)100.00%PASS
contain-body-overflow-004.html(1/1)100.00%PASS
contain-body-t-o-001.html(1/1)100.00%PASS
contain-body-t-o-002.html(1/1)100.00%PASS
contain-body-t-o-003.html(1/1)100.00%PASS
contain-body-t-o-004.html(1/1)100.00%PASS
contain-body-w-m-001.html(1/1)100.00%PASS
contain-body-w-m-002.html(1/1)100.00%PASS
contain-body-w-m-003.html(1/1)100.00%PASS
contain-body-w-m-004.html(1/1)100.00%PASS
contain-chrome-thcrash-001.html(1/1)100.00%PASS
contain-content-001.html(1/1)100.00%PASS
contain-content-002.html(1/1)100.00%PASS
contain-content-003.html(1/1)100.00%PASS
contain-content-004.html(0/1)0.00%FAIL
contain-content-011.html(0/1)0.00%FAIL
contain-crash.html(1/1)100.00%PASS
contain-flexbox-outline.html(1/1)100.00%PASS
contain-html-bg-001.html(0/1)0.00%FAIL
contain-html-bg-002.html(0/1)0.00%FAIL
contain-html-bg-003.html(0/1)0.00%FAIL
contain-html-bg-004.html(0/1)0.00%FAIL
contain-html-dir-001.html(1/1)100.00%PASS
contain-html-dir-002.html(1/1)100.00%PASS
contain-html-dir-003.html(1/1)100.00%PASS
contain-html-dir-004.html(1/1)100.00%PASS
contain-html-overflow-001.html(1/1)100.00%PASS
contain-html-overflow-002.html(1/1)100.00%PASS
contain-html-overflow-003.html(1/1)100.00%PASS
contain-html-overflow-004.html(1/1)100.00%PASS
contain-html-t-o-001.html(1/1)100.00%PASS
contain-html-t-o-002.html(1/1)100.00%PASS
contain-html-t-o-003.html(1/1)100.00%PASS
contain-html-t-o-004.html(1/1)100.00%PASS
contain-html-w-m-001.html(1/1)100.00%PASS
contain-html-w-m-002.html(1/1)100.00%PASS
contain-html-w-m-003.html(1/1)100.00%PASS
contain-html-w-m-004.html(1/1)100.00%PASS
contain-inline-size-bfc-floats-001.html(0/1)0.00%FAIL
contain-inline-size-bfc-floats-002.html(0/1)0.00%FAIL
contain-inline-size-fieldset.html(0/1)0.00%FAIL
contain-inline-size-flex.html(0/1)0.00%FAIL
contain-inline-size-flexitem.html(0/1)0.00%FAIL
contain-inline-size-grid-auto-fit.html(1/1)100.00%PASS
contain-inline-size-grid-indefinite-height-min-height-flex-row.html(0/1)0.00%SKIP
contain-inline-size-grid-stretches-auto-rows.html(1/1)100.00%PASS
contain-inline-size-grid.html(0/1)0.00%FAIL
contain-inline-size-intrinsic.html(0/1)0.00%FAIL
contain-inline-size-legend.html(0/1)0.00%FAIL
contain-inline-size-multicol.html(0/1)0.00%FAIL
contain-inline-size-regular-container.html(0/1)0.00%FAIL
contain-inline-size-removed.html(1/1)100.00%PASS
contain-inline-size-replaced.html(2/30)6.67%FAIL
contain-inline-size-table.html(0/1)0.00%FAIL
contain-inline-size-vertical-rl-.html(0/1)0.00%FAIL
contain-layout-001.html(1/1)100.00%PASS
contain-layout-002.html(0/1)0.00%FAIL
contain-layout-003.html(0/1)0.00%FAIL
contain-layout-004.html(0/1)0.00%FAIL
contain-layout-005.html(0/1)0.00%FAIL
contain-layout-006.html(1/1)100.00%PASS
contain-layout-007.html(1/1)100.00%PASS
contain-layout-009.html(0/1)0.00%FAIL
contain-layout-010.html(0/1)0.00%FAIL
contain-layout-011.html(0/1)0.00%FAIL
contain-layout-012.html(0/1)0.00%FAIL
contain-layout-013.html(1/1)100.00%PASS
contain-layout-014.html(1/1)100.00%PASS
contain-layout-016.html(1/1)100.00%PASS
contain-layout-017.html(0/1)0.00%FAIL
contain-layout-018.html(0/1)0.00%FAIL
contain-layout-019.html(1/1)100.00%PASS
contain-layout-020.html(1/1)100.00%PASS
contain-layout-021.html(1/1)100.00%PASS
contain-layout-baseline-001.html(1/1)100.00%PASS
contain-layout-baseline-002.html(0/1)0.00%FAIL
contain-layout-baseline-003.html(0/1)0.00%FAIL
contain-layout-baseline-004.html(0/1)0.00%FAIL
contain-layout-baseline-005.html(1/1)100.00%PASS
contain-layout-baseline-006.html(0/1)0.00%FAIL
contain-layout-breaks-001.html(1/1)100.00%PASS
contain-layout-breaks-002.html(0/1)0.00%FAIL
contain-layout-button-001.tentative.html(0/1)0.00%FAIL
contain-layout-button-002.tentative.html(1/1)100.00%PASS
contain-layout-cell-001.html(0/1)0.00%FAIL
contain-layout-cell-002.html(0/1)0.00%FAIL
contain-layout-containing-block-absolute-001.html(1/1)100.00%PASS
contain-layout-containing-block-absolute-002.html(1/1)100.00%PASS
contain-layout-containing-block-fixed-001.html(1/1)100.00%PASS
contain-layout-dynamic-001.html(0/4)0.00%FAIL
contain-layout-dynamic-004.html(0/1)0.00%FAIL
contain-layout-dynamic-005.html(0/1)0.00%FAIL
contain-layout-flexbox-001.html(1/1)100.00%PASS
contain-layout-formatting-context-float-001.html(1/1)100.00%PASS
contain-layout-formatting-context-margin-001.html(1/1)100.00%PASS
contain-layout-grid-001.html(1/1)100.00%PASS
contain-layout-ifc-022.html(1/1)100.00%PASS
contain-layout-ignored-cases-ib-split-001.html(1/1)100.00%PASS
contain-layout-ignored-cases-no-principal-box-001.html(1/1)100.00%PASS
contain-layout-ignored-cases-no-principal-box-002.html(1/1)100.00%PASS
contain-layout-ignored-cases-no-principal-box-003.html(1/1)100.00%PASS
contain-layout-independent-formatting-context-001.html(1/1)100.00%PASS
contain-layout-independent-formatting-context-002.html(1/1)100.00%PASS
contain-layout-independent-formatting-context-003.html(1/1)100.00%PASS
contain-layout-ink-overflow-013.html(1/1)100.00%PASS
contain-layout-ink-overflow-014.html(1/1)100.00%PASS
contain-layout-ink-overflow-015.html(1/1)100.00%PASS
contain-layout-ink-overflow-016.html(1/1)100.00%PASS
contain-layout-ink-overflow-017.html(1/1)100.00%PASS
contain-layout-ink-overflow-018.html(1/1)100.00%PASS
contain-layout-ink-overflow-019.html(1/1)100.00%PASS
contain-layout-ink-overflow-020.html(1/1)100.00%PASS
contain-layout-overflow-001.html(1/1)100.00%PASS
contain-layout-overflow-002.html(1/1)100.00%PASS
contain-layout-select-001.tentative.html(0/1)0.00%FAIL
contain-layout-size-003.html(0/1)0.00%FAIL
contain-layout-stacking-context-001.html(0/1)0.00%FAIL
contain-layout-suppress-baseline-001.html(0/1)0.00%FAIL
contain-layout-suppress-baseline-002.html(1/1)100.00%PASS
contain-paint-001.html(1/1)100.00%PASS
contain-paint-002.html(1/1)100.00%PASS
contain-paint-004.html(1/1)100.00%PASS
contain-paint-005.html(0/1)0.00%FAIL
contain-paint-006.html(0/1)0.00%FAIL
contain-paint-007.html(1/1)100.00%PASS
contain-paint-008.html(0/1)0.00%FAIL
contain-paint-009.html(1/1)100.00%PASS
contain-paint-010.html(1/1)100.00%PASS
contain-paint-011.html(1/1)100.00%PASS
contain-paint-012.html(1/1)100.00%PASS
contain-paint-014.html(1/1)100.00%PASS
contain-paint-015.html(1/1)100.00%PASS
contain-paint-016.html(1/1)100.00%PASS
contain-paint-017.html(1/1)100.00%PASS
contain-paint-018.html(1/1)100.00%PASS
contain-paint-019.html(1/1)100.00%PASS
contain-paint-020.html(1/1)100.00%PASS
contain-paint-021.html(0/1)0.00%FAIL
contain-paint-022.html(1/1)100.00%PASS
contain-paint-023.html(0/1)0.00%FAIL
contain-paint-024.html(1/1)100.00%PASS
contain-paint-025.html(0/1)0.00%FAIL
contain-paint-026.html(1/1)100.00%PASS
contain-paint-047.html(0/1)0.00%FAIL
contain-paint-048.html(1/1)100.00%PASS
contain-paint-049.html(1/1)100.00%PASS
contain-paint-050.html(1/1)100.00%PASS
contain-paint-baseline-001.html(1/1)100.00%PASS
contain-paint-cell-001.html(0/1)0.00%FAIL
contain-paint-cell-002.html(0/1)0.00%FAIL
contain-paint-change-opacity.html(1/1)100.00%PASS
contain-paint-clip-001.html(0/1)0.00%FAIL
contain-paint-clip-002.html(1/1)100.00%PASS
contain-paint-clip-003.html(1/1)100.00%PASS
contain-paint-clip-004.html(1/1)100.00%PASS
contain-paint-clip-005.html(0/1)0.00%FAIL
contain-paint-clip-006.html(1/1)100.00%PASS
contain-paint-clip-011.html(1/1)100.00%PASS
contain-paint-clip-012.html(1/1)100.00%PASS
contain-paint-clip-013.html(1/1)100.00%PASS
contain-paint-clip-014.html(1/1)100.00%PASS
contain-paint-clip-015.html(1/1)100.00%PASS
contain-paint-clip-016.html(1/1)100.00%PASS
contain-paint-clip-017.html(1/1)100.00%PASS
contain-paint-clip-018.html(1/1)100.00%PASS
contain-paint-clip-019.html(1/1)100.00%PASS
contain-paint-containing-block-absolute-001.html(1/1)100.00%PASS
contain-paint-containing-block-fixed-001.html(1/1)100.00%PASS
contain-paint-dynamic-001.html(2/4)50.00%FAIL
contain-paint-dynamic-002.html(0/1)0.00%FAIL
contain-paint-dynamic-003.html(1/1)100.00%PASS
contain-paint-dynamic-004.html(0/1)0.00%FAIL
contain-paint-dynamic-005.html(0/1)0.00%FAIL
contain-paint-formatting-context-float-001.html(1/1)100.00%PASS
contain-paint-formatting-context-margin-001.html(1/1)100.00%PASS
contain-paint-ifc-011.html(1/1)100.00%PASS
contain-paint-ignored-cases-ib-split-001.html(1/1)100.00%PASS
contain-paint-ignored-cases-internal-table-001a.html(1/1)100.00%PASS
contain-paint-ignored-cases-internal-table-001b.html(1/1)100.00%PASS
contain-paint-ignored-cases-no-principal-box-001.html(1/1)100.00%PASS
contain-paint-ignored-cases-ruby-containing-block-001.html(1/1)100.00%PASS
contain-paint-ignored-cases-ruby-stacking-and-clipping-001.html(1/1)100.00%PASS
contain-paint-independent-formatting-context-001.html(1/1)100.00%PASS
contain-paint-independent-formatting-context-002.html(1/1)100.00%PASS
contain-paint-independent-formatting-context-003.html(1/1)100.00%PASS
contain-paint-size-001.html(0/1)0.00%FAIL
contain-paint-size-002.html(0/1)0.00%FAIL
contain-paint-size-003.html(0/1)0.00%FAIL
contain-paint-stacking-context-001a.html(0/1)0.00%FAIL
contain-paint-stacking-context-001b.html(0/1)0.00%FAIL
contain-paint-table-001.html(0/1)0.00%FAIL
contain-paint-table-002.html(0/1)0.00%FAIL
contain-size-001.html(1/1)100.00%PASS
contain-size-002.html(1/1)100.00%PASS
contain-size-003.html(1/1)100.00%PASS
contain-size-004.html(1/1)100.00%PASS
contain-size-005.html(1/1)100.00%PASS
contain-size-006.html(1/1)100.00%PASS
contain-size-007.html(1/1)100.00%PASS
contain-size-008.html(1/1)100.00%PASS
contain-size-009.html(1/1)100.00%PASS
contain-size-010.html(1/1)100.00%PASS
contain-size-011.html(0/1)0.00%FAIL
contain-size-012.html(0/1)0.00%FAIL
contain-size-012b.html(0/1)0.00%FAIL
contain-size-013.html(0/1)0.00%FAIL
contain-size-014.html(1/1)100.00%PASS
contain-size-021.html(0/1)0.00%FAIL
contain-size-023.html(0/1)0.00%FAIL
contain-size-025.html(0/1)0.00%FAIL
contain-size-027.html(0/1)0.00%FAIL
contain-size-041.html(0/1)0.00%FAIL
contain-size-042.html(0/1)0.00%FAIL
contain-size-051.html(1/1)100.00%PASS
contain-size-052.html(1/1)100.00%PASS
contain-size-056.html(1/1)100.00%PASS
contain-size-061.html(0/1)0.00%FAIL
contain-size-062.html(0/1)0.00%FAIL
contain-size-063.html(0/1)0.00%FAIL
contain-size-064.html(0/1)0.00%FAIL
contain-size-baseline-001.html(1/1)100.00%PASS
contain-size-block-001.html(0/1)0.00%FAIL
contain-size-block-002.html(0/1)0.00%FAIL
contain-size-block-003.html(0/1)0.00%FAIL
contain-size-block-004.html(0/1)0.00%FAIL
contain-size-borders.html(0/1)0.00%FAIL
contain-size-breaks-001.html(0/1)0.00%FAIL
contain-size-button-001.html(0/1)0.00%FAIL
contain-size-button-002.html(0/1)0.00%FAIL
contain-size-dynamic-001.html(2/4)50.00%FAIL
contain-size-fieldset-001.html(0/1)0.00%FAIL
contain-size-fieldset-002.html(0/1)0.00%FAIL
contain-size-fieldset-003.html(0/1)0.00%FAIL
contain-size-fieldset-004.html(0/1)0.00%FAIL
contain-size-flex-001.html(0/1)0.00%FAIL
contain-size-flexbox-001.html(0/1)0.00%FAIL
contain-size-flexbox-002.html(1/1)100.00%PASS
contain-size-grid-001.html(0/1)0.00%FAIL
contain-size-grid-002.html(0/1)0.00%FAIL
contain-size-grid-003.html(34/39)87.18%FAIL
contain-size-grid-004.html(30/48)62.50%FAIL
contain-size-grid-005.html(0/1)0.00%FAIL
contain-size-grid-006.html(8/16)50.00%FAIL
contain-size-grid-indefinite-height-min-height-flex-row.html(1/1)100.00%PASS
contain-size-grid-stretches-auto-rows.html(1/1)100.00%PASS
contain-size-inline-block-001.html(0/1)0.00%FAIL
contain-size-inline-block-002.html(0/1)0.00%FAIL
contain-size-inline-block-003.html(0/1)0.00%FAIL
contain-size-inline-block-004.html(0/1)0.00%FAIL
contain-size-inline-flex-001.html(0/1)0.00%FAIL
contain-size-monolithic-001.html(0/1)0.00%FAIL
contain-size-monolithic-002.html(1/1)100.00%PASS
contain-size-multicol-001.html(0/1)0.00%FAIL
contain-size-multicol-002.html(0/1)0.00%FAIL
contain-size-multicol-003.html(0/1)0.00%FAIL
contain-size-multicol-004.html(1/1)100.00%PASS
contain-size-multicol-as-flex-item.html(0/1)0.00%FAIL
contain-size-removed.html(1/1)100.00%PASS
contain-size-replaced-001.html(0/1)0.00%FAIL
contain-size-replaced-002.html(0/1)0.00%FAIL
contain-size-replaced-003a.html(0/1)0.00%FAIL
contain-size-replaced-003b.html(0/1)0.00%FAIL
contain-size-replaced-003c.html(0/1)0.00%FAIL
contain-size-replaced-004.html(0/1)0.00%FAIL
contain-size-replaced-005.html(0/1)0.00%FAIL
contain-size-replaced-006.html(0/1)0.00%FAIL
contain-size-replaced-007.html(1/1)100.00%PASS
contain-size-scrollbars-001.html(0/1)0.00%FAIL
contain-size-scrollbars-002.html(0/1)0.00%FAIL
contain-size-scrollbars-003.html(0/1)0.00%FAIL
contain-size-scrollbars-004.html(1/1)100.00%PASS
contain-size-select-001.html(1/1)100.00%PASS
contain-size-select-002.html(1/1)100.00%PASS
contain-size-select-elem-001.html(1/1)100.00%PASS
contain-size-select-elem-002.html(1/1)100.00%PASS
contain-size-select-elem-003.html(1/1)100.00%PASS
contain-size-select-elem-004.html(1/1)100.00%PASS
contain-size-select-elem-005.html(1/1)100.00%PASS
contain-size-table-caption-001.html(1/1)100.00%PASS
contain-strict-001.html(0/1)0.00%FAIL
contain-strict-002.html(0/1)0.00%FAIL
contain-strict-003.html(0/1)0.00%FAIL
contain-strict-011.html(0/1)0.00%FAIL
contain-style-baseline-001.html(1/1)100.00%PASS
contain-style-breaks-001.html(1/1)100.00%PASS
contain-style-breaks-002.html(1/1)100.00%PASS
contain-style-breaks-003.html(1/1)100.00%PASS
contain-style-breaks-004.html(1/1)100.00%PASS
contain-style-breaks-005.html(1/1)100.00%PASS
contain-style-counters-001.html(0/1)0.00%FAIL
contain-style-counters-002.html(0/1)0.00%FAIL
contain-style-counters-003.html(0/1)0.00%FAIL
contain-style-counters-004.html(0/1)0.00%FAIL
contain-style-counters-005.html(0/1)0.00%FAIL
contain-style-dynamic-001.html(2/4)50.00%FAIL
contain-style-dynamic-002.html(1/1)100.00%PASS
contain-style-ol-ordinal-li-container.html(1/1)100.00%PASS
contain-style-ol-ordinal-pseudo-reversed.html(0/1)0.00%FAIL
contain-style-ol-ordinal-pseudo.html(0/1)0.00%FAIL
contain-style-ol-ordinal-reversed.html(1/1)100.00%PASS
contain-style-ol-ordinal-start-reversed.html(0/1)0.00%FAIL
contain-style-ol-ordinal-start.html(0/1)0.00%FAIL
contain-style-ol-ordinal.html(1/1)100.00%PASS
contain-style-remove-element-crash.html(1/1)100.00%PASS
contain-subgrid-001.html(1/1)100.00%PASS
container-iframe-resize-events.html(1/1)100.00%PASS
container-type-important.html(0/1)0.00%FAIL
counter-scoping-001.html(0/1)0.00%FAIL
counter-scoping-002.html(0/1)0.00%FAIL
counter-scoping-003.html(0/1)0.00%FAIL
counter-scoping-004.html(0/1)0.00%FAIL
inheritance.html(2/2)100.00%PASS
quote-scoping-001.html(0/1)0.00%FAIL
quote-scoping-002.html(0/1)0.00%FAIL
quote-scoping-003.html(0/1)0.00%FAIL
quote-scoping-004.html(0/1)0.00%FAIL
quote-scoping-empty-style-boundaries.html(1/1)100.00%PASS
quote-scoping-invalidation-001.html(0/1)0.00%FAIL
quote-scoping-invalidation-002.html(0/1)0.00%FAIL
quote-scoping-invalidation-003.html(0/1)0.00%FAIL
quote-scoping-invalidation-004.html(0/1)0.00%FAIL
quote-scoping-shadow-dom-crash.html(1/1)100.00%PASS