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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 / content-visibility

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/content-visibility

Data from commit:
89e5e61 Implement `text-align-last` (#998) (2026-10-01)

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total48.32%(114/240)47.50%(139/458)30.35%
parsing33.33%(1/3)33.33%(5/11)45.45%
crashtests100.00%(7/7)100.00%(7/7)100.00%
TestSubtestsSubtest %Status
animation-display-lock.html(0/4)0.00%FAIL
content-visibility-001.html(0/1)0.00%FAIL
content-visibility-002.html(1/1)100.00%PASS
content-visibility-003.html(0/1)0.00%FAIL
content-visibility-004.html(0/1)0.00%FAIL
content-visibility-005.html(0/1)0.00%FAIL
content-visibility-006.html(0/1)0.00%FAIL
content-visibility-007.html(0/1)0.00%FAIL
content-visibility-008.html(0/1)0.00%FAIL
content-visibility-009.html(0/1)0.00%FAIL
content-visibility-010.html(0/1)0.00%FAIL
content-visibility-011.html(0/1)0.00%FAIL
content-visibility-012.html(1/1)100.00%PASS
content-visibility-013.html(1/1)100.00%PASS
content-visibility-014.html(1/1)100.00%PASS
content-visibility-015.html(0/1)0.00%FAIL
content-visibility-016.html(0/1)0.00%FAIL
content-visibility-017.html(0/1)0.00%FAIL
content-visibility-018.html(0/1)0.00%FAIL
content-visibility-019.sub.https.html(1/1)100.00%PASS
content-visibility-020.html(0/1)0.00%FAIL
content-visibility-021.html(0/1)0.00%FAIL
content-visibility-022.html(0/1)0.00%FAIL
content-visibility-023.html(1/1)100.00%PASS
content-visibility-024.html(1/1)100.00%PASS
content-visibility-025.html(1/1)100.00%PASS
content-visibility-026.html(0/2)0.00%FAIL
content-visibility-027.html(1/1)100.00%PASS
content-visibility-028.html(0/1)0.00%FAIL
content-visibility-029.html(0/1)0.00%FAIL
content-visibility-030.html(0/1)0.00%FAIL
content-visibility-031.html(0/1)0.00%FAIL
content-visibility-032.html(0/1)0.00%FAIL
content-visibility-033.sub.https.html(1/1)100.00%PASS
content-visibility-034.html(0/1)0.00%FAIL
content-visibility-035.html(0/1)0.00%FAIL
content-visibility-036.html(1/1)100.00%PASS
content-visibility-037.html(0/1)0.00%FAIL
content-visibility-038.html(0/1)0.00%FAIL
content-visibility-039.html(0/1)0.00%FAIL
content-visibility-040.html(0/1)0.00%FAIL
content-visibility-041.html(0/1)0.00%FAIL
content-visibility-042.html(1/1)100.00%PASS
content-visibility-043.html(0/1)0.00%FAIL
content-visibility-044.html(0/1)0.00%FAIL
content-visibility-045.html(0/1)0.00%FAIL
content-visibility-046.html(1/1)100.00%PASS
content-visibility-047.html(0/1)0.00%SKIP
content-visibility-048.html(0/2)0.00%SKIP
content-visibility-049.html(0/1)0.00%FAIL
content-visibility-050.html(0/1)0.00%FAIL
content-visibility-051.html(0/1)0.00%FAIL
content-visibility-052.html(1/1)100.00%PASS
content-visibility-053.html(0/1)0.00%FAIL
content-visibility-054.html(0/1)0.00%FAIL
content-visibility-055.html(0/1)0.00%FAIL
content-visibility-056.html(0/1)0.00%FAIL
content-visibility-057.html(1/1)100.00%PASS
content-visibility-058.html(0/1)0.00%FAIL
content-visibility-060.html(0/1)0.00%FAIL
content-visibility-061.html(0/1)0.00%FAIL
content-visibility-062.html(0/1)0.00%FAIL
content-visibility-063.html(0/1)0.00%FAIL
content-visibility-064.html(1/1)100.00%PASS
content-visibility-065.html(1/1)100.00%PASS
content-visibility-066.html(1/1)100.00%PASS
content-visibility-067.html(1/1)100.00%PASS
content-visibility-068.html(0/1)0.00%FAIL
content-visibility-069.html(0/1)0.00%FAIL
content-visibility-070.html(0/1)0.00%FAIL
content-visibility-071.html(0/6)0.00%FAIL
content-visibility-072.html(1/5)20.00%FAIL
content-visibility-073.html(1/1)100.00%PASS
content-visibility-074.html(1/1)100.00%PASS
content-visibility-075.html(1/1)100.00%PASS
content-visibility-076.html(0/1)0.00%FAIL
content-visibility-077.html(0/1)0.00%FAIL
content-visibility-078.html(0/1)0.00%FAIL
content-visibility-079.html(1/1)100.00%PASS
content-visibility-080.html(0/1)0.00%FAIL
content-visibility-081.html(1/1)100.00%PASS
content-visibility-082.html(0/1)0.00%FAIL
content-visibility-083.html(1/1)100.00%PASS
content-visibility-084.html(1/1)100.00%PASS
content-visibility-085.html(1/1)100.00%PASS
content-visibility-086.html(0/1)0.00%FAIL
content-visibility-087.html(0/1)0.00%FAIL
content-visibility-088.html(0/1)0.00%FAIL
content-visibility-089.html(0/1)0.00%FAIL
content-visibility-090.html(0/1)0.00%FAIL
content-visibility-091.html(1/1)100.00%PASS
content-visibility-092.html(0/1)0.00%FAIL
content-visibility-093.html(0/1)0.00%FAIL
content-visibility-094.html(1/1)100.00%PASS
content-visibility-095.html(0/1)0.00%FAIL
content-visibility-096.html(1/1)100.00%PASS
content-visibility-097.html(1/1)100.00%PASS
content-visibility-098.html(1/1)100.00%PASS
content-visibility-099.html(1/1)100.00%PASS
content-visibility-anchor-positioning-001.html(0/1)0.00%FAIL
content-visibility-anchor-positioning-002.html(0/1)0.00%FAIL
content-visibility-anchor-positioning-003.html(0/1)0.00%FAIL
content-visibility-anchor-positioning-004.html(0/1)0.00%FAIL
content-visibility-anchor-positioning-005.html(0/1)0.00%FAIL
content-visibility-anchor-positioning-006.html(0/1)0.00%FAIL
content-visibility-anchor-positioning-007.html(0/1)0.00%FAIL
content-visibility-animation-and-scroll.html(0/1)0.00%FAIL
content-visibility-animation-becomes-visible.html(0/1)0.00%FAIL
content-visibility-animation-in-auto-subtree.html(0/5)0.00%FAIL
content-visibility-animation-with-scroll-timeline-in-auto-subtree.html(0/1)0.00%FAIL
content-visibility-animation-with-scroll-timeline-in-hidden-subtree.html(0/1)0.00%FAIL
content-visibility-auto-applied-to-th-crash.html(1/1)100.00%PASS
content-visibility-auto-first-observation-immediate.html(0/1)0.00%FAIL
content-visibility-auto-img-001.html(1/1)100.00%PASS
content-visibility-auto-in-iframe.html(1/1)100.00%PASS
content-visibility-auto-intrinsic-width.html(1/1)100.00%PASS
content-visibility-auto-nested-scroll.html(1/1)100.00%PASS
content-visibility-auto-nested.html(1/1)100.00%PASS
content-visibility-auto-print.html(1/1)100.00%PASS
content-visibility-auto-relevancy-updates.html(0/3)0.00%FAIL
content-visibility-auto-selection-crash.html(1/1)100.00%PASS
content-visibility-auto-state-changed-first-observation.html(0/2)0.00%SKIP
content-visibility-auto-state-changed-removed.html(0/1)0.00%SKIP
content-visibility-auto-state-changed.html(0/7)0.00%SKIP
content-visibility-auto-svg-image.html(1/1)100.00%PASS
content-visibility-auto-svg-text.html(0/1)0.00%FAIL
content-visibility-auto-text-fragment.html(0/2)0.00%SKIP
content-visibility-background-clip-crash.html(1/1)100.00%PASS
content-visibility-canvas.html(1/1)100.00%PASS
content-visibility-continuations-crash.html(1/1)100.00%PASS
content-visibility-fieldset-size.html(0/1)0.00%FAIL
content-visibility-forced-layout-client-rects.html(5/5)100.00%PASS
content-visibility-form-controls-crash.html(1/1)100.00%PASS
content-visibility-hidden-and-float-inside-skipped-subtree.html(0/1)0.00%FAIL
content-visibility-hidden-and-innertext.html(0/1)0.00%FAIL
content-visibility-hidden-boundingbox-query.html(0/1)0.00%FAIL
content-visibility-hidden-offsetTop-left-width-height.html(1/1)100.00%PASS
content-visibility-hidden-scrollTop-left-width-height.html(1/1)100.00%PASS
content-visibility-hidden-with-column-spanner.html(0/1)0.00%FAIL
content-visibility-hit-test-contents-crash.html(1/1)100.00%PASS
content-visibility-img.html(0/1)0.00%SKIP
content-visibility-in-relpos-before-crash.html(1/1)100.00%PASS
content-visibility-in-svg-000-crash.html(1/1)100.00%PASS
content-visibility-input-image.html(0/1)0.00%SKIP
content-visibility-interpolation.html(0/130)0.00%FAIL
content-visibility-intrinsic-size-001.html(1/1)100.00%PASS
content-visibility-layout-containment-001.html(3/8)37.50%FAIL
content-visibility-layout-paint-containment-001.html(3/8)37.50%FAIL
content-visibility-on-display-contents.html(1/1)100.00%PASS
content-visibility-on-g.html(1/1)100.00%PASS
content-visibility-on-root-svg.html(1/1)100.00%PASS
content-visibility-on-ruby.html(1/1)100.00%PASS
content-visibility-output-crash.html(1/1)100.00%PASS
content-visibility-paint-containment-001.html(0/1)0.00%FAIL
content-visibility-paint-containment-002.html(1/1)100.00%PASS
content-visibility-paint-containment-003.html(1/1)100.00%PASS
content-visibility-paint-containment-004.html(1/1)100.00%PASS
content-visibility-resize-observer-no-error.html(0/1)0.00%FAIL
content-visibility-selection-crash.html(1/1)100.00%PASS
content-visibility-size-containment-001.html(5/13)38.46%FAIL
content-visibility-style-containment-001.html(5/8)62.50%FAIL
content-visibility-svg-path.html(0/9)0.00%FAIL
content-visibility-svg-rect.html(0/4)0.00%FAIL
content-visibility-svg-text.html(0/5)0.00%FAIL
content-visibility-svg.html(0/1)0.00%FAIL
content-visibility-video.html(1/1)100.00%PASS
content-visibility-vs-scrollIntoView-001.html(1/1)100.00%PASS
content-visibility-vs-scrollIntoView-002.html(0/1)0.00%FAIL
content-visibility-vs-scrollIntoView-003.html(0/1)0.00%SKIP
content-visibility-web-animation-in-auto-subtree.html(0/1)0.00%FAIL
content-visibility-with-float-crash.html(1/1)100.00%PASS
content-visibility-with-popover-top-layer-000.html(0/1)0.00%FAIL
content-visibility-with-popover-top-layer-001.html(0/1)0.00%FAIL
content-visibility-with-popover-top-layer-002.html(0/1)0.00%FAIL
content-visibility-with-popover-top-layer-003.html(1/1)100.00%PASS
content-visibility-with-popover-top-layer-004.html(1/1)100.00%PASS
content-visibility-with-popover-top-layer-005.html(1/1)100.00%PASS
content-visibility-with-popover-top-layer-006.html(0/1)0.00%FAIL
content-visibility-with-popover-top-layer-and-auto-descendant.html(1/1)100.00%PASS
content-visibility-with-popover-top-layer-hide-after-addition.html(0/1)0.00%FAIL
content-visibility-with-top-layer-000.html(0/1)0.00%FAIL
content-visibility-with-top-layer-001.html(0/1)0.00%FAIL
content-visibility-with-top-layer-002.html(0/1)0.00%FAIL
content-visibility-with-top-layer-003.html(1/1)100.00%PASS
content-visibility-with-top-layer-004.html(1/1)100.00%PASS
content-visibility-with-top-layer-005.html(1/1)100.00%PASS
content-visibility-with-top-layer-006.html(0/1)0.00%FAIL
content-visibility-with-top-layer-007.html(0/1)0.00%FAIL
content-visibility-with-top-layer-008.html(0/1)0.00%FAIL
content-visibility-with-top-layer-and-auto-descendant.html(1/1)100.00%PASS
content-visibility-with-top-layer-hide-after-addition.html(0/1)0.00%FAIL
content-visibility-with-top-layer-in-auto-subtree-removal.html(1/1)100.00%PASS
contentvisibility-nestedslot-crash.html(1/1)100.00%PASS
detach-locked-slot-children-crash.html(1/1)100.00%PASS
display-ruby-text-crash.html(1/1)100.00%PASS
document-element-computed-style.html(1/1)100.00%PASS
dynamic-change-paint-fully-obscuring-child-001.html(0/1)0.00%FAIL
dynamic-change-with-slotted-text.html(0/1)0.00%FAIL
element-reassigned-to-skipped-slot.html(0/1)0.00%FAIL
element-reassigned-to-slot-in-skipped-subtree.html(0/1)0.00%FAIL
hidden-execcommand-crash.html(1/1)100.00%PASS
hidden-pseudo-element-removed-crash.html(1/1)100.00%PASS
inheritance.html(0/2)0.00%FAIL
locked-frame-crash.html(1/1)100.00%PASS
meter-selection-crash.html(1/1)100.00%PASS
scrollIntoView-target-with-contents-hidden.html(0/1)0.00%FAIL
scrollIntoView-with-focus-target-with-contents-hidden.html(1/1)100.00%PASS
slot-content-visibility-1-crash.html(1/1)100.00%PASS
slot-content-visibility-10-crash.html(1/1)100.00%PASS
slot-content-visibility-11-crash.html(1/1)100.00%PASS
slot-content-visibility-12-crash.html(1/1)100.00%PASS
slot-content-visibility-13-crash.html(1/1)100.00%PASS
slot-content-visibility-14-crash.html(1/1)100.00%PASS
slot-content-visibility-15-crash.html(1/1)100.00%PASS
slot-content-visibility-16-crash.html(1/1)100.00%PASS
slot-content-visibility-17-crash.html(1/1)100.00%PASS
slot-content-visibility-18-crash.html(1/1)100.00%PASS
slot-content-visibility-19-crash.html(1/1)100.00%PASS
slot-content-visibility-2-crash.html(1/1)100.00%PASS
slot-content-visibility-20-crash.html(1/1)100.00%PASS
slot-content-visibility-21-crash.html(1/1)100.00%PASS
slot-content-visibility-22-crash.html(1/1)100.00%PASS
slot-content-visibility-3-crash.html(1/1)100.00%PASS
slot-content-visibility-4-crash.html(1/1)100.00%PASS
slot-content-visibility-5-crash.html(1/1)100.00%PASS
slot-content-visibility-6-crash.html(1/1)100.00%PASS
slot-content-visibility-7-crash.html(1/1)100.00%PASS
slot-content-visibility-8-crash.html(1/1)100.00%PASS
slot-content-visibility-9-crash.html(1/1)100.00%PASS
touch-action-beside-display-locked-fixedpos-iframe-crash.html(1/1)100.00%PASS