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WPT

This page compares scores on the Web Platform Tests across web engines, using the latest master runs from wpt.fyi and Blitz's own test runner.

wpt / layout-instability

Spec: Layout Instability API ↗

Runs: Chrome 158.0.8110.0 (wpt@51af97519, 2026-10-17) | Firefox 160.0a1 (wpt@51af97519, 2026-10-17) | Safari 254 preview (wpt@d6658f1eb, 2026-10-17) | Ladybird 1.0-d60c8 (wpt@23b0b89b1, 2026-10-18) | Servo Servo 0.7 (wpt@df642c414, 2026-10-17) | Blitz fb8d6c15e (wpt@cd1d8aa5b, 2026-10-17)

Score history

Percentage of subtests passing over time, one master run per day. Every engine's percentage is relative to the same denominator: the total number of subtests known to any engine in the latest runs (so lines are not distorted by tests being added to WPT, and an engine that skips tests is not flattered for it).

1 month3 months6 months1 year2 years4 yearsAll time
0%20%40%60%80%100%Nov 2025Dec 2025Jan 2026Feb 2026Mar 2026Apr 2026May 2026Jun 2026Jul 2026Aug 2026Sep 2026Oct 2026ChromeFirefoxSafariLadybirdServo

Sort: alphabetical | by subtest count

AreaChromeFirefoxSafariLadybirdServoBlitz
Total99.1%117/1181.6%2/1181.6%2/1181.6%2/1181.6%2/1180.0%0/118
TestChromeFirefoxSafariLadybirdServoBlitz
Total99.1%117/1181.6%2/1181.6%2/1181.6%2/1181.6%2/118NO DATA
absolute-child-shift-with-parent-contain.htmlPASSFAILFAILFAILFAILNOT RUN
absolute-child-shift-with-parent-negative-overflow.htmlPASSFAILFAILFAILFAILNOT RUN
absolute-child-shift-with-parent-overflow.htmlPASSFAILFAILFAILFAILNOT RUN
absolute-child-shift-with-parent-will-change.htmlFAILFAILFAILFAILFAILNOT RUN
add-remove-position-fixed.htmlPASSFAILFAILFAILFAILNOT RUN
add-remove-position-sticky.htmlPASSFAILFAILFAILFAILNOT RUN
attribution-rectangles-css-pixels.html2/20/20/20/20/2NOT RUN
body-display-change.htmlPASSFAILFAILFAILFAILNOT RUN
buffer-layout-shift.htmlPASSFAILFAILFAILFAILNOT RUN
buffered-flag.htmlPASSFAILFAILFAILFAILNOT RUN
child-shift-with-parent-overflow-hidden.htmlPASSFAILFAILFAILFAILNOT RUN
child-shift-with-parent-overflow-x-clip.htmlPASSFAILFAILFAILFAILNOT RUN
child-shift-with-parent.htmlPASSFAILFAILFAILFAILNOT RUN
clip-negative-bottom-margin.htmlPASSFAILFAILFAILFAILNOT RUN
composited-element-movement.htmlPASSFAILFAILFAILFAILNOT RUN
contain-paint-fully-clipped.htmlPASSFAILFAILFAILFAILNOT RUN
content-visibility-auto-offscreen.htmlPASSFAILFAILFAILFAILNOT RUN
content-visibility-auto-onscreen.htmlPASSFAILFAILFAILFAILNOT RUN
content-visibility-auto-resize.htmlPASSFAILFAILFAILFAILNOT RUN
content-visibility-hidden.htmlPASSFAILFAILFAILFAILNOT RUN
display-change-with-transform.htmlPASSFAILFAILFAILFAILNOT RUN
expand-above-viewport.htmlPASSFAILFAILFAILFAILNOT RUN
fixed-position-move.htmlPASSFAILFAILFAILFAILNOT RUN
fully-clipped-visual-rect.htmlPASSFAILFAILFAILFAILNOT RUN
idlharness.html35/352/352/352/352/35NOT RUN
ignore-fixed-and-sticky.htmlPASSFAILFAILFAILFAILNOT RUN
inline-flow-shift-one-line.htmlPASSFAILFAILFAILFAILNOT RUN
inline-flow-shift-vertical-rl.htmlPASSFAILFAILFAILFAILNOT RUN
inline-flow-shift.htmlPASSFAILFAILFAILFAILNOT RUN
input-timestamp.htmlPASSFAILFAILFAILFAILNOT RUN
local-shift-without-viewport-shift-2.htmlPASSFAILFAILFAILFAILNOT RUN
local-shift-without-viewport-shift.htmlPASSFAILFAILFAILFAILNOT RUN
main-frame.htmlPASSTIMEOUTTIMEOUTTIMEOUTTIMEOUTNOT RUN
mousemove-becomes-drag.htmlPASSFAILFAILFAILFAILNOT RUN
move-distance-clamped.htmlPASSFAILFAILFAILFAILNOT RUN
move-transformed.htmlPASSFAILFAILFAILFAILNOT RUN
multi-clip-visual-rect.htmlPASSFAILFAILFAILFAILNOT RUN
multicol-000.htmlPASSFAILFAILFAILFAILNOT RUN
multicol-001.htmlPASSFAILFAILFAILFAILNOT RUN
opacity-nonzero-to-zero.htmlPASSFAILFAILFAILFAILNOT RUN
opacity-zero-layout-and-visible.htmlPASSFAILFAILFAILFAILNOT RUN
opacity-zero.htmlPASSFAILFAILFAILFAILNOT RUN
outline.htmlPASSFAILFAILFAILFAILNOT RUN
partially-clipped-visual-rect.htmlPASSFAILFAILFAILFAILNOT RUN
pointerdown-becomes-scroll.htmlPASSFAILFAILFAILFAILNOT RUN
pointerdown-becomes-tap.htmlPASSFAILFAILFAILFAILNOT RUN
pointermove-becomes-drag.htmlPASSFAILFAILFAILFAILNOT RUN
recent-input.htmlPASSFAILFAILFAILFAILNOT RUN
rtl-distance.htmlPASSFAILFAILFAILFAILNOT RUN
shift-into-viewport-inline-direction-and-scroll.htmlPASSFAILFAILFAILFAILNOT RUN
shift-into-viewport-inline-direction.htmlPASSFAILFAILFAILFAILNOT RUN
shift-into-viewport.htmlPASSFAILFAILFAILFAILNOT RUN
shift-invisible.htmlPASSFAILFAILFAILFAILNOT RUN
shift-outside-viewport-inline-direction.htmlPASSFAILFAILFAILFAILNOT RUN
shift-outside-viewport.htmlPASSFAILFAILFAILFAILNOT RUN
shift-scroll-anchoring-natural-scroll.htmlPASSFAILFAILFAILFAILNOT RUN
shift-while-scrolled.htmlPASSFAILFAILFAILFAILNOT RUN
shift-with-counter-scroll-and-transform.htmlPASSFAILFAILFAILFAILNOT RUN
shift-with-counter-scroll-and-translate.htmlPASSFAILFAILFAILFAILNOT RUN
shift-with-counterscroll-2.htmlPASSFAILFAILFAILFAILNOT RUN
shift-with-counterscroll.htmlPASSFAILFAILFAILFAILNOT RUN
shift-with-overflow-status-change.htmlPASSFAILFAILFAILFAILNOT RUN
simple-block-movement.htmlPASSERRORERRORERRORERRORNOT RUN
sources-enclosure.htmlPASSFAILFAILFAILFAILNOT RUN
sources-maximpact.htmlPASSFAILFAILFAILFAILNOT RUN
sources-pseudo-element.htmlPASSFAILFAILFAILFAILNOT RUN
sources.htmlPASSFAILFAILFAILFAILNOT RUN
sticky-descendant-move.htmlPASSFAILFAILFAILFAILNOT RUN
sticky-layout-no-change.htmlPASSFAILFAILFAILFAILNOT RUN
sub-frame.htmlPASSFAILFAILFAILFAILNOT RUN
supported-layout-type.htmlPASSFAILFAILFAILFAILNOT RUN
toJSON.htmlPASSFAILFAILFAILFAILNOT RUN
transform-above-filter-dynamic.htmlPASSFAILFAILFAILFAILNOT RUN
transform-above-perspective-dynamic.htmlPASSFAILFAILFAILFAILNOT RUN
transform-change.htmlPASSFAILFAILFAILFAILNOT RUN
transform-counter-layout-shift.htmlPASSFAILFAILFAILFAILNOT RUN
transform.htmlPASSFAILFAILFAILFAILNOT RUN
translate-change.htmlPASSFAILFAILFAILFAILNOT RUN
translate-counter-layout-shift.htmlPASSFAILFAILFAILFAILNOT RUN
video.htmlPASSFAILFAILFAILFAILNOT RUN
visibility-hidden-layout-and-visible.htmlPASSFAILFAILFAILFAILNOT RUN
visibility-hidden.htmlPASSFAILFAILFAILFAILNOT RUN
visible-to-hidden.htmlPASSFAILFAILFAILFAILNOT RUN