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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-overflow

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total26.90%(150/560)26.79%(174/631)27.58%
line-clamp13.80%(37/268)13.81%(37/268)13.81%
scroll-markers24.50%(25/102)24.51%(25/102)24.51%
TestSubtestsSubtest %Status
abspos-shrink-to-fit-with-scrollable-descendant.html(1/1)100.00%PASS
add-scroller-then-scroll-content-into-view.html(0/1)0.00%FAIL
before-after-pseudo-element-scrolling.html(0/1)0.00%FAIL
button-with-scrollable-descendant.html(1/1)100.00%PASS
clip-001.html(1/1)100.00%PASS
clip-002.html(0/1)0.00%FAIL
clip-003.html(0/1)0.00%FAIL
clip-004.html(0/1)0.00%FAIL
clip-005.html(0/1)0.00%FAIL
clip-006.html(1/1)100.00%PASS
clip-007.html(1/1)100.00%PASS
clip-008.html(0/1)0.00%FAIL
clipped-scroller-add-content.html(0/1)0.00%FAIL
column-style-change-triggers-relayout.html(0/1)0.00%FAIL
content-change-then-scroll-into-view.html(0/1)0.00%FAIL
display-flex-svg-overflow-default.html(1/1)100.00%PASS
document-element-overflow-hidden-scroll.html(0/1)0.00%FAIL
dynamic-visible-to-clip-001.html(0/1)0.00%FAIL
dynamic-visible-to-clip-002.html(1/1)100.00%PASS
ellipsis-with-image-crash.html(1/1)100.00%PASS
float-with-relpos-and-transform.html(1/1)100.00%PASS
float-with-scrollable-descendant.html(1/1)100.00%PASS
incremental-scroll-002.html(1/1)100.00%PASS
incremental-scroll.html(1/1)100.00%PASS
inline-block-with-scrollable-descendant.html(1/1)100.00%PASS
input-scrollable-region-001.html(0/1)0.00%FAIL
margin-block-end-scroll-area-001.html(0/1)0.00%FAIL
max-content-with-float-scrollable-descendant.html(1/1)100.00%PASS
max-content-with-multiple-scrollable-descendants.html(1/1)100.00%PASS
max-width-container-with-scrollable-descendant.html(1/1)100.00%PASS
multicol-in-orthogonal-writing-mode-crash.html(1/1)100.00%PASS
no-scrollable-overflow-vertical-rl-2.html(1/1)100.00%PASS
no-scrollable-overflow-vertical-rl.html(1/1)100.00%PASS
orthogonal-writing-mode-with-scrollable-descendant.html(0/1)0.00%FAIL
overflow-auto-scrollbar-gutter-intrinsic-001.html(1/1)100.00%PASS
overflow-auto-scrollbar-gutter-intrinsic-002.html(1/1)100.00%PASS
overflow-auto-scrollbar-gutter-intrinsic-003.html(1/1)100.00%PASS
overflow-body-propagation-001.html(1/1)100.00%PASS
overflow-body-propagation-002.html(1/1)100.00%PASS
overflow-body-propagation-003.html(1/1)100.00%PASS
overflow-body-propagation-004.html(1/1)100.00%PASS
overflow-body-propagation-005.html(1/1)100.00%PASS
overflow-body-propagation-006.html(1/1)100.00%PASS
overflow-body-propagation-007.html(0/1)0.00%FAIL
overflow-body-propagation-008.html(0/1)0.00%FAIL
overflow-body-propagation-009.html(0/1)0.00%FAIL
overflow-body-propagation-010.html(1/1)100.00%PASS
overflow-body-propagation-011.html(1/1)100.00%PASS
overflow-body-propagation-012.html(1/1)100.00%PASS
overflow-body-propagation-013.html(0/1)0.00%CRASH
overflow-body-propagation-014.html(0/1)0.00%FAIL
overflow-body-propagation-015.html(0/1)0.00%FAIL
overflow-body-propagation-016.html(0/1)0.00%FAIL
overflow-canvas.html(1/1)100.00%PASS
overflow-clip-002-crash.html(1/1)100.00%PASS
overflow-clip-cant-scroll.html(1/1)100.00%PASS
overflow-clip-content-visual-overflow.html(0/1)0.00%FAIL
overflow-clip-margin-001.html(0/1)0.00%FAIL
overflow-clip-margin-002.html(1/1)100.00%PASS
overflow-clip-margin-003.html(1/1)100.00%PASS
overflow-clip-margin-004.html(0/1)0.00%FAIL
overflow-clip-margin-005.html(1/1)100.00%PASS
overflow-clip-margin-006.html(1/1)100.00%PASS
overflow-clip-margin-007.html(0/1)0.00%FAIL
overflow-clip-margin-008.html(1/1)100.00%PASS
overflow-clip-margin-009.html(1/1)100.00%PASS
overflow-clip-margin-010.html(0/1)0.00%FAIL
overflow-clip-margin-011.html(0/1)0.00%FAIL
overflow-clip-margin-012.html(0/1)0.00%FAIL
overflow-clip-margin-013.html(0/1)0.00%FAIL
overflow-clip-margin-014.html(0/1)0.00%FAIL
overflow-clip-margin-015.html(0/1)0.00%FAIL
overflow-clip-margin-016.html(0/1)0.00%FAIL
overflow-clip-margin-017.html(0/1)0.00%FAIL
overflow-clip-margin-018.html(0/1)0.00%FAIL
overflow-clip-margin-019.html(0/1)0.00%FAIL
overflow-clip-margin-020.html(0/1)0.00%FAIL
overflow-clip-margin-021.html(0/1)0.00%FAIL
overflow-clip-margin-022.html(0/1)0.00%FAIL
overflow-clip-margin-border-radius-002.html(0/1)0.00%FAIL
overflow-clip-margin-border-radius.html(0/1)0.00%FAIL
overflow-clip-margin-content-box-dynamic.html(1/1)100.00%PASS
overflow-clip-margin-invalidation.html(0/1)0.00%FAIL
overflow-clip-margin-mul-column-border-box.html(0/1)0.00%FAIL
overflow-clip-margin-mul-column-content-box.html(0/1)0.00%FAIL
overflow-clip-margin-mul-column-padding-box.html(1/1)100.00%PASS
overflow-clip-margin-svg.html(0/1)0.00%FAIL
overflow-clip-margin-visual-box-and-value-with-border-radius.html(0/1)0.00%FAIL
overflow-clip-margin-visual-box-and-value.html(0/1)0.00%FAIL
overflow-clip-margin-visual-box.html(0/1)0.00%FAIL
overflow-clip-rounded-table.html(1/1)100.00%PASS
overflow-clip-transform-001.html(0/1)0.00%FAIL
overflow-clip-x-visible-y-svg.html(0/1)0.00%FAIL
overflow-clip-y-visible-x-svg.html(0/1)0.00%FAIL
overflow-clipped-transparent-border-clip.html(0/1)0.00%FAIL
overflow-does-not-apply-to-inline-box.html(1/1)100.00%PASS
overflow-ellipsis-dynamic-001.html(0/1)0.00%FAIL
overflow-empty-child-box.html(4/4)100.00%PASS
overflow-hidden-resize-with-stacking-context-child.html(0/1)0.00%FAIL
overflow-img-border-radius.html(0/1)0.00%FAIL
overflow-img-display-table.html(0/1)0.00%FAIL
overflow-img-object-position.html(0/1)0.00%FAIL
overflow-img-scroll-non-replaced.html(0/1)0.00%FAIL
overflow-img-scroll-replaced.html(1/1)100.00%PASS
overflow-img-svg.html(0/1)0.00%FAIL
overflow-img.html(0/1)0.00%FAIL
overflow-inline-block-with-opacity.html(1/1)100.00%PASS
overflow-negative-margin-dynamic.html(1/1)100.00%PASS
overflow-negative-margin.html(1/1)100.00%PASS
overflow-no-frameset-propagation.html(1/1)100.00%PASS
overflow-overlay.html(1/1)100.00%PASS
overflow-recalc-001.html(0/1)0.00%FAIL
overflow-replaced-element-001.html(0/1)0.00%FAIL
overflow-replaced-element-002.html(1/1)100.00%PASS
overflow-scroll-big-border-small-content.html(1/1)100.00%PASS
overflow-scroll-intrinsic-001.html(1/1)100.00%PASS
overflow-scroll-resize-visibility-hidden.html(0/1)0.00%FAIL
overflow-video.html(1/1)100.00%PASS
paint-containment-svg.html(0/1)0.00%FAIL
rounded-overflow-clip-visible.html(0/1)0.00%FAIL
rounded-overflow-visible-clip.html(0/1)0.00%FAIL
scrollable-overflow-empty-newline-span.html(1/1)100.00%PASS
scrollable-overflow-float.html(0/1)0.00%FAIL
scrollable-overflow-input-001.html(0/1)0.00%FAIL
scrollable-overflow-input-002.html(0/1)0.00%FAIL
scrollable-overflow-padding-inline.html(6/6)100.00%PASS
scrollable-overflow-padding-input.html(4/5)80.00%FAIL
scrollable-overflow-padding.html(6/30)20.00%FAIL
scrollable-overflow-self-collapsing.html(0/3)0.00%FAIL
scrollable-overflow-textarea.html(0/1)0.00%FAIL
scrollable-overflow-transform-001.html(0/3)0.00%FAIL
scrollable-overflow-transform-002.html(0/3)0.00%FAIL
scrollable-overflow-transform-003.html(0/3)0.00%FAIL
scrollable-overflow-transform-004.html(0/3)0.00%FAIL
scrollable-overflow-transform-005.tentative.html(0/6)0.00%FAIL
scrollable-overflow-transform-006.html(0/2)0.00%FAIL
scrollable-overflow-transform-007.html(0/2)0.00%FAIL
scrollable-overflow-transform-008.html(0/2)0.00%FAIL
scrollable-overflow-transform-009.html(6/6)100.00%PASS
scrollable-overflow-transform-010.tentative.html(0/2)0.00%FAIL
scrollable-overflow-transform-011.html(1/1)100.00%PASS
scrollable-overflow-with-nested-elements-001.html(1/1)100.00%PASS
scrollable-overflow-with-nested-elements-002.html(2/2)100.00%PASS
scrollable-overflow-with-nested-elements-003.html(1/1)100.00%PASS
scrollable-overflow-with-nested-elements-004.html(1/1)100.00%PASS
scrollable-overflow-with-nested-elements-005.html(0/1)0.00%FAIL
scrollable-overflow-zero-one-axis.html(0/6)0.00%FAIL
scrollbar-empty-001.html(1/1)100.00%PASS
scrollbar-empty-002.html(1/1)100.00%PASS
scrollbar-gutter-002.html(1/1)100.00%PASS
scrollbar-gutter-003.html(1/1)100.00%PASS
scrollbar-gutter-abspos-001.html(1/1)100.00%PASS
scrollbar-gutter-dynamic-001.html(0/1)0.00%FAIL
scrollbar-gutter-dynamic-002.html(1/1)100.00%PASS
scrollbar-gutter-dynamic-003.html(1/1)100.00%PASS
scrollbar-gutter-dynamic-004.html(1/1)100.00%PASS
scrollbar-gutter-fixedpos-001.html(1/1)100.00%PASS
scrollbar-gutter-fixedpos-002.html(1/1)100.00%PASS
scrollbar-gutter-fixedpos-003.html(1/1)100.00%PASS
scrollbar-gutter-fixedpos-004.html(1/1)100.00%PASS
scrollbar-gutter-root-both-edges.html(0/1)0.00%FAIL
scrollbar-gutter-root.html(0/1)0.00%FAIL
scrollbar-gutter-rtl-002.html(1/1)100.00%PASS
scrollbar-gutter-scroll-into-view.html(0/1)0.00%FAIL
scrollbar-gutter-vertical-lr-002.html(1/1)100.00%PASS
scrollbar-gutter-vertical-rl-002.html(1/1)100.00%PASS
scrollbar-gutter-with-background-gradient.html(1/1)100.00%PASS
scrollbar-large-scale-in-iframe.html(1/1)100.00%PASS
scrollbars-chrome-bug-001.html(0/1)0.00%FAIL
select-size-overflow-001.html(1/1)100.00%PASS
single-axis-overflow-clip-rtl.html(1/1)100.00%PASS
single-axis-overflow-scroll-to-clip.html(0/1)0.00%FAIL
table-header-group-overflow-crash.html(1/1)100.00%PASS
table-max-content-with-scrollable-descendant.html(1/1)100.00%PASS
text-overflow-ellipsis-001.html(0/1)0.00%FAIL
text-overflow-ellipsis-002.html(0/1)0.00%FAIL
text-overflow-ellipsis-003.html(0/1)0.00%FAIL
text-overflow-ellipsis-changing-scroll.html(1/1)100.00%PASS
text-overflow-ellipsis-editable-div-with-caret.html(1/1)100.00%PASS
text-overflow-ellipsis-editing-input.html(1/1)100.00%PASS
text-overflow-ellipsis-rtl-001.html(0/1)0.00%FAIL
text-overflow-ellipsis-textarea-with-caret.html(1/1)100.00%PASS
text-overflow-ellipsis-vertical-001.html(0/1)0.00%FAIL
text-overflow-ellipsis-vertical-rtl-001.html(0/1)0.00%FAIL
text-overflow-scroll-001.html(0/1)0.00%FAIL
text-overflow-scroll-rtl-001.html(0/1)0.00%FAIL
text-overflow-scroll-vertical-lr-001.html(0/1)0.00%FAIL
text-overflow-scroll-vertical-lr-rtl-001.html(0/1)0.00%FAIL
text-overflow-scroll-vertical-rl-001.html(0/1)0.00%FAIL
text-overflow-scroll-vertical-rl-rtl-001.html(0/1)0.00%FAIL