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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 / preload

Spec: https://w3c.github.io/preload/ ↗

Runs: Chrome 158.0.8110.0 (wpt@fa98dec9b, 2026-10-18) | Firefox 160.0a1 (wpt@51af97519, 2026-10-17) | Safari 254 preview (wpt@470a7adf8, 2026-10-18) | Ladybird 1.0-44fe0 (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
Total72.9%671/92069.0%635/92061.6%567/92034.5%318/92071.7%660/9200.0%0/920
TestChromeFirefoxSafariLadybirdServoBlitz
Total72.9%671/92069.0%635/92061.6%567/92034.5%318/92071.7%660/920NO DATA
avoid-delaying-onload-link-modulepreload-exec.htmlPASSPASSPASSPASSPASSNOT RUN
avoid-delaying-onload-link-modulepreload.htmlPASSPASSPASSPASSPASSNOT RUN
avoid-delaying-onload-link-preload-style.htmlPASSPASSFAILPASSPASSNOT RUN
avoid-delaying-onload-link-preload.htmlPASSPASSFAILPASSPASSNOT RUN
avoid-prefetching-on-text-plain.htmlPASSPASSPASSPASSPASSNOT RUN
cross-origin-link-header-on-subresource.sub.htmlFAILFAILPASSFAILFAILNOT RUN
delaying-onload-link-preload-after-discovery.htmlPASSPASSPASSFAILPASSNOT RUN
download-resources.htmlPASSFAILPASSFAILPASSNOT RUN
dynamic-adding-preload-imagesrcset.htmlPASSPASSPASSFAILPASSNOT RUN
dynamic-adding-preload-nonce.html2/22/22/22/22/2NOT RUN
dynamic-adding-preload.htmlPASSPASSPASSFAILPASSNOT RUN
link-header-modulepreload.htmlPASSPASSPASSTIMEOUTTIMEOUTNOT RUN
link-header-on-subresource.htmlFAILFAILPASSFAILFAILNOT RUN
link-header-preload-delay-onload.htmlPASSPASSPASSFAILPASSNOT RUN
link-header-preload-imagesrcset.htmlPASSPASSPASSFAILPASSNOT RUN
link-header-preload-non-html.html4/52/55/50/55/5NOT RUN
link-header-preload-nonce.html2/22/22/21/22/2NOT RUN
link-header-preload.htmlPASSPASSPASSFAILPASSNOT RUN
link-preload-as-case-insensitive.html7/77/77/71/71/7NOT RUN
link-preload-empty-href-attribute-crash.htmlPASSPASSPASSPASSPASSNOT RUN
modulepreload-already-in-module-map.html5/55/55/55/55/5NOT RUN
modulepreload-as.html21/2825/2816/2828/2828/28NOT RUN
modulepreload-consumed-by-script.htmlPASSPASSPASSPASSPASSNOT RUN
modulepreload-fires-before-dependencies.html3/33/33/33/33/3NOT RUN
modulepreload-json.htmlPASSFAILPASSPASSPASSNOT RUN
modulepreload-multiple.html3/31/32/33/33/3NOT RUN
modulepreload-sri-importmap.htmlPASSPASSFAILPASSPASSNOT RUN
modulepreload-sri.htmlPASSPASSFAILPASSPASSNOT RUN
modulepreload-style.htmlPASSFAILFAILPASSPASSNOT RUN
modulepreload-text.htmlFAILFAILPASSPASSPASSNOT RUN
modulepreload.html49/5540/5543/5554/5546/55NOT RUN
onerror-event.htmlFAILFAILFAILFAILFAILNOT RUN
onload-event.htmlFAILFAILFAILFAILFAILNOT RUN
preconnect-onerror-event.html3/33/33/33/33/3NOT RUN
preconnect.htmlPASSPASSTIMEOUTERRORPASSNOT RUN
prefetch-accept.htmlPASSPASSTIMEOUTTIMEOUTPASSNOT RUN
prefetch-cache.html4/44/40/40/44/4NOT RUN
prefetch-document.html5/54/50/50/53/5NOT RUN
prefetch-events.html5/97/92/92/99/9NOT RUN
prefetch-headers.https.html2/33/30/30/33/3NOT RUN
prefetch-load-event.htmlPASSPASSPASSPASSPASSNOT RUN
prefetch-time-to-fetch.https.html2/22/20/20/21/2NOT RUN
prefetch-types.https.html25/2525/250/250/2525/25NOT RUN
preload-connect-to-doc.html5/55/55/55/55/5NOT RUN
preload-csp.sub.htmlPASSPASSPASSPASSPASSNOT RUN
preload-default-csp.sub.htmlPASSPASSPASSPASSPASSNOT RUN
preload-dynamic-csp.htmlPASSFAILPASSPASSPASSNOT RUN
preload-error.sub.html62/6857/6848/6857/6864/68NOT RUN
preload-font-crossorigin.html4/44/42/42/44/4NOT RUN
preload-imagesrcset-in-markup.html2/22/22/20/22/2NOT RUN
preload-imagesrcset-no-href.html3/33/33/30/33/3NOT RUN
preload-in-data-doc.htmlPASSPASSPASSPASSPASSNOT RUN
preload-invalid-resources.html2/22/22/20/22/2NOT RUN
preload-link-cached-stylesheet-different-doc.htmlPASSPASSPASSPASSPASSNOT RUN
preload-nonce.sub.html2/22/22/22/22/2NOT RUN
preload-referrer-policy-subresource-header.tentative.html?isCrossOriginPreload=false&isCrossOriginResource=false0/490/497/490/490/49NOT RUN
preload-referrer-policy-subresource-header.tentative.html?isCrossOriginPreload=false&isCrossOriginResource=true0/490/497/490/490/49NOT RUN
preload-referrer-policy-subresource-header.tentative.html?isCrossOriginPreload=true&isCrossOriginResource=false0/490/4914/490/490/49NOT RUN
preload-referrer-policy-subresource-header.tentative.html?isCrossOriginPreload=true&isCrossOriginResource=true0/490/4914/490/490/49NOT RUN
preload-referrer-policy.html196/196196/196196/1962/196196/196NOT RUN
preload-resource-match.https.html56/5857/5820/587/5857/58NOT RUN
preload-strict-dynamic.sub.html3/32/32/32/32/3NOT RUN
preload-time-to-fetch.https.html9/109/106/105/107/10NOT RUN
preload-type-match.html45/4536/4545/4543/4543/45NOT RUN
preload-with-type.htmlPASSPASSPASSFAILFAILNOT RUN
preload-with-unsupported-type.htmlPASSPASSPASSFAILPASSNOT RUN
preload-xhr.html2/22/20/22/22/2NOT RUN
reflected-as-value.html9/1313/139/1313/1312/13NOT RUN
single-download-late-used-preload.htmlPASSPASSPASSFAILPASSNOT RUN
single-download-preload.htmlPASSFAILPASSFAILPASSNOT RUN
subresource-integrity-font.html13/2315/2312/238/235/23NOT RUN
subresource-integrity-partial-image.htmlPASSPASSPASSPASSPASSNOT RUN
subresource-integrity.html71/7756/7740/7742/7767/77NOT RUN
supported-as-values.html?as=audio&expected=0PASSPASSPASSPASSPASSNOT RUN
supported-as-values.html?as=fetch&expected=1PASSPASSPASSFAILPASSNOT RUN
supported-as-values.html?as=font&expected=1PASSPASSPASSFAILPASSNOT RUN
supported-as-values.html?as=garbagefoobar&expected=0PASSPASSPASSPASSPASSNOT RUN
supported-as-values.html?as=iframe&expected=0PASSPASSPASSPASSPASSNOT RUN
supported-as-values.html?as=image&expected=1PASSPASSPASSFAILPASSNOT RUN
supported-as-values.html?as=json&expected=0PASSPASSPASSPASSPASSNOT RUN
supported-as-values.html?as=object&expected=0PASSPASSPASSPASSPASSNOT RUN
supported-as-values.html?as=script&expected=1PASSPASSPASSFAILPASSNOT RUN
supported-as-values.html?as=style&expected=1PASSPASSPASSFAILPASSNOT RUN
supported-as-values.html?as=track&expected=1PASSFAILPASSFAILPASSNOT RUN
supported-as-values.html?as=video&expected=0PASSPASSPASSPASSPASSNOT RUN
supported-as-values.html?as=worklet&expected=0PASSPASSPASSPASSPASSNOT RUN