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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 / webstorage

Spec: https://html.spec.whatwg.org/multipage/webstorage.html ↗

Runs: Chrome 158.0.8110.0 (wpt@456f346c2, 2026-10-18) | Firefox 160.0a1 (wpt@b58866519, 2026-10-18) | Safari 254 preview (wpt@470a7adf8, 2026-10-18) | Ladybird 1.0-b284f (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
Total98.9%1277/129199.6%1287/129199.3%1282/129199.7%1288/129198.4%1271/12910.0%0/1291
TestChromeFirefoxSafariLadybirdServoBlitz
Total98.9%1277/129199.6%1287/129199.3%1282/129199.7%1288/129198.4%1271/1291NO DATA
defineProperty.window.html12/1212/1212/1212/1212/12NOT RUN
document-domain.htmlPASSPASSTIMEOUTPASSTIMEOUTNOT RUN
event_basic.html2/22/22/22/22/2NOT RUN
event_body_attribute.html2/22/22/22/22/2NOT RUN
event_case_sensitive.html2/22/22/22/22/2NOT RUN
event_constructor.window.html6/66/66/66/66/6NOT RUN
event_initstorageevent.window.html5/55/55/55/55/5NOT RUN
event_local_key.htmlPASSPASSPASSPASSPASSNOT RUN
event_local_newvalue.htmlPASSPASSPASSPASSPASSNOT RUN
event_local_oldvalue.htmlPASSPASSPASSPASSPASSNOT RUN
event_local_removeitem.htmlPASSPASSPASSPASSPASSNOT RUN
event_local_storagearea.htmlPASSPASSPASSPASSPASSNOT RUN
event_local_url.htmlPASSPASSPASSPASSPASSNOT RUN
event_local_window_open_oldvalue.htmlPASSPASSPASSPASSPASSNOT RUN
event_no_duplicates.html8/88/88/88/88/8NOT RUN
event_session_key.htmlPASSPASSPASSPASSPASSNOT RUN
event_session_newvalue.htmlPASSPASSPASSPASSPASSNOT RUN
event_session_oldvalue.htmlPASSPASSPASSPASSPASSNOT RUN
event_session_removeitem.htmlPASSPASSPASSPASSPASSNOT RUN
event_session_storagearea.htmlPASSPASSPASSPASSPASSNOT RUN
event_session_url.htmlPASSPASSPASSPASSPASSNOT RUN
event_session_window_open_scope.htmlPASSPASSPASSPASSPASSNOT RUN
event_setattribute.html2/22/22/22/22/2NOT RUN
localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.htmlPASSPASSPASSTIMEOUTFAILNOT RUN
localstorage-basic-partitioned.sub.htmlPASSPASSPASSFAILTIMEOUTNOT RUN
localstorage-cross-origin-iframe.https.window.htmlPASSPASSPASSPASSPASSNOT RUN
localstorage-share-data-unrelated-origins.htmlPASSPASSPASSPASSPASSNOT RUN
missing_arguments.window.html10/1010/1010/1010/1010/10NOT RUN
sessionStorage-basic-partitioned.sub.htmlPASSPASSPASSFAILTIMEOUTNOT RUN
set.window.html8/2016/2016/2020/2016/20NOT RUN
storage_builtins.window.html0/22/22/22/22/2NOT RUN
storage_clear.window.html2/22/22/22/22/2NOT RUN
storage_enumerate.window.html4/44/44/44/44/4NOT RUN
storage_functions_not_overwritten.window.html2/22/22/22/22/2NOT RUN
storage_getitem.window.html8/88/88/88/88/8NOT RUN
storage_in.window.html4/44/44/44/44/4NOT RUN
storage_indexing.window.html8/88/88/88/88/8NOT RUN
storage_key.window.html22/2222/2222/2222/2222/22NOT RUN
storage_key_empty_string.window.html2/22/22/22/22/2NOT RUN
storage_length.window.html4/44/44/44/44/4NOT RUN
storage_local_quota_independent_from_session.window.htmlPASSPASSFAILPASSPASSNOT RUN
storage_local_setitem_quotaexceedederr.window.htmlPASSPASSFAILPASSPASSNOT RUN
storage_local_window_open.window.htmlPASSPASSPASSPASSPASSNOT RUN
storage_removeitem.window.html8/88/88/88/88/8NOT RUN
storage_session_quota_independent_from_local.window.htmlPASSPASSFAILPASSPASSNOT RUN
storage_session_setitem_quotaexceedederr.window.htmlPASSPASSFAILPASSPASSNOT RUN
storage_session_window_noopener.window.htmlPASSPASSPASSPASSPASSNOT RUN
storage_session_window_open.window.htmlPASSPASSPASSPASSPASSNOT RUN
storage_session_window_reopen.window.htmlPASSPASSPASSPASSPASSNOT RUN
storage_set_value_enumerate.window.html2/22/22/22/22/2NOT RUN
storage_setitem.window.html1106/11061106/11061106/11061106/11061094/1106NOT RUN
storage_string_conversion.window.html2/22/22/22/22/2NOT RUN
storage_supported_property_names.window.html4/44/44/44/44/4NOT RUN
symbol-props.window.html14/1414/1414/1414/1414/14NOT RUN