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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 / custom-elements / reactions

Spec: https://html.spec.whatwg.org/multipage/custom-elements.html ↗

Runs: Chrome 158.0.8110.0 (wpt@4c84956f8, 2026-10-18) | Firefox 160.0a1 (wpt@b58866519, 2026-10-18) | Safari 254 preview (wpt@850b36a56, 2026-10-18) | Ladybird 1.0-38d35 (wpt@4c84956f8, 2026-10-18) | Servo Servo 0.7 (wpt@df642c414, 2026-10-17) | Blitz 38ca4e777 (wpt@cd1d8aa5b, 2026-10-18)

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
Total99.2%534/53896.6%520/53862.2%335/53895.1%512/53885.5%460/5380.0%0/538
customized-builtins100.0%203/203100.0%203/2030.4%1/203100.0%203/20376.3%155/2030.0%0/203
TestChromeFirefoxSafariLadybirdServoBlitz
Total98.8%331/33594.6%317/33599.7%334/33592.2%309/33591.0%305/335NO DATA
Animation.html3/33/33/30/30/3NOT RUN
AriaMixin-element-attributes.html16/162/1616/1616/160/16NOT RUN
AriaMixin-string-attributes.html80/8080/8080/8080/8080/80NOT RUN
AriaMixin-string-attributes.tentative.html8/88/88/88/88/8NOT RUN
Attr.html2/22/22/22/22/2NOT RUN
CSSStyleDeclaration.html30/3030/3030/3030/3030/30NOT RUN
ChildNode.html7/77/77/74/77/7NOT RUN
DOMStringMap.html8/88/88/84/88/8NOT RUN
DOMTokenList.html19/1919/1919/1919/1919/19NOT RUN
Document.html12/1212/1212/1212/1211/12NOT RUN
Element.html47/4747/4747/4746/4747/47NOT RUN
ElementContentEditable.html2/22/22/22/22/2NOT RUN
HTMLAnchorElement.htmlPASSPASSPASSPASSPASSNOT RUN
HTMLElement.html22/2222/2222/2222/2216/22NOT RUN
HTMLOptionElement.html1/21/21/21/21/2NOT RUN
HTMLOptionsCollection.html5/65/66/63/65/6NOT RUN
HTMLOutputElement.html2/22/22/22/22/2NOT RUN
HTMLSelectElement.html5/75/77/73/75/7NOT RUN
HTMLTableElement.html10/1010/1010/1010/1010/10NOT RUN
HTMLTableRowElement.htmlPASSPASSPASSPASSPASSNOT RUN
HTMLTableSectionElement.html2/22/22/22/22/2NOT RUN
HTMLTitleElement.htmlPASSPASSPASSPASSPASSNOT RUN
NamedNodeMap.html14/1414/1414/1414/1414/14NOT RUN
Node.html14/1414/1414/1411/1414/14NOT RUN
ParentNode.html4/44/44/42/44/4NOT RUN
Range.html10/1010/1010/108/1010/10NOT RUN
Selection.htmlPASSPASSPASSPASSPASSNOT RUN
ShadowRoot.html3/33/33/33/33/3NOT RUN
with-exceptions.htmlPASSPASSPASSPASSPASSNOT RUN