1729702 - Speculative parser wpt test img-srcset is flaky

Status: NEW

(Core :: DOM: HTML Parser, defect)

Description

[Simon Pieters [:zcorpan]]

See https://github.com/web-platform-tests/wpt/pull/24521#issuecomment-915217464

Test	Subtest	Results	Messages
/html/syntax/speculative-parsing/generated/page-load/img-srcset.tentative.html	Speculative parsing, page load: img-srcset	FAIL: 1/10, PASS: 9/10	Unhandled rejection: assert_not_equals: speculative case did not fetch got disallowed value ""

I could reproduce this locally by reloading the test a couple of times in Firefox Nightly.

Increasing the time to 3000ms doesn't fix the flakiness when testing locally.

Comment 1

[Simon Pieters [:zcorpan]]

Per test history in https://wpt.fyi/results/html/syntax/speculative-parsing/generated/page-load/img-srcset.tentative.html?label=experimental&label=master&aligned this test is still flaky on wpt.fyi infra.

Also the test is marked flaky (except on Android) in https://searchfox.org/mozilla-central/source/testing/web-platform/meta/html/syntax/speculative-parsing/generated/page-load/img-srcset.tentative.html.ini