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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 / intersection-observer / v2

Spec: Intersection Observer ↗

Runs: Chrome 158.0.8110.0 (wpt@850b36a56, 2026-10-18) | Firefox 160.0a1 (wpt@b58866519, 2026-10-18) | Safari 254 preview (wpt@850b36a56, 2026-10-18) | Ladybird 1.0-1706f (wpt@850b36a56, 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
Total78.5%55/7021.4%15/7021.4%15/7030.0%21/7045.7%32/700.0%0/70
TestChromeFirefoxSafariLadybirdServoBlitz
Total78.5%55/7021.4%15/7021.4%15/7030.0%21/7045.7%32/70NO DATA
3d-transform-flattened-preserve-3d-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
3d-transform-occlusion-2.htmlPASSFAILFAILFAILPASSNOT RUN
3d-transform-occlusion.htmlPASSERRORERRORERRORERRORNOT RUN
3d-transform-overflow-control-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
3d-transform-z-order-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
animated-occlusion.html2/22/22/22/22/2NOT RUN
animated-opacity.htmlPASSERRORERRORPASSPASSNOT RUN
blur-filter.html1/31/31/32/32/3NOT RUN
border-radius-shadow-occlusion-replaced.htmlPASSFAILFAILFAILPASSNOT RUN
border-radius-shadow-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
border-shape-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
border-shape-overflow-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
box-reflect.html2/21/21/21/21/2NOT RUN
box-shadow.html4/41/41/41/42/4NOT RUN
cross-origin-effects.sub.htmlPASSFAILFAILFAILFAILNOT RUN
cross-origin-occlusion.sub.htmlPASSFAILFAILFAILFAILNOT RUN
delay-test.htmlPASSFAILFAILFAILFAILNOT RUN
drop-shadow-filter-vertical-rl.html1/31/31/32/32/3NOT RUN
iframe-target.html1/21/21/22/22/2NOT RUN
inline-occlusion.html4/41/41/41/41/4NOT RUN
nested-cross-origin.sub.htmlPASSFAILFAILFAILFAILNOT RUN
position-absolute-overflow-visible-and-not-visible.htmlPASSPASSPASSFAILFAILNOT RUN
position-relative.html2/21/21/21/21/2NOT RUN
scaled-target.htmlPASSFAILFAILFAILFAILNOT RUN
simple-effects.html1/51/51/52/52/5NOT RUN
simple-occlusion-svg-foreign-object.html1/41/41/42/42/4NOT RUN
simple-occlusion.html1/41/41/42/42/4NOT RUN
svg-drop-shadow-occlusion.htmlPASSFAILFAILFAILPASSNOT RUN
svg-foreign-object-filter-occlusion.htmlPASSFAILFAILFAILFAILNOT RUN
svg-group-filter-occlusion.htmlPASSFAILFAILFAILFAILNOT RUN
svg-image-filter-occlusion.htmlPASSFAILFAILFAILFAILNOT RUN
svg-reference-filter-occlusion.htmlPASSFAILFAILFAILFAILNOT RUN
svg-root-filter-occlusion.html2/20/20/20/20/2NOT RUN
svg-shape-filter-occlusion.htmlPASSFAILFAILFAILFAILNOT RUN
svg-text-filter-occlusion.html2/20/20/20/20/2NOT RUN
text-editor-occlusion.html4/41/41/41/41/4NOT RUN
text-shadow.html4/41/41/41/42/4NOT RUN
z-index-changes.htmlPASSFAILFAILFAILFAILNOT RUN