[Webkit-unassigned] [Bug 234410] New: REGRESSION (r286944?): web-platform-tests/html/semantics/text-level-semantics/the-a-element/a-download-click tests have become flaky failures

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234410

            Bug ID: 234410
           Summary: REGRESSION (r286944?):
                    web-platform-tests/html/semantics/text-level-semantics
                    /the-a-element/a-download-click tests have become
                    flaky failures
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com
                CC: webkit-bot-watchers-bugzilla at group.apple.com,
                    webkit-bug-importer at group.apple.com, youennf at gmail.com

The following two tests have become flaky failures on iOS and macOS, both having an unexpected "+Download size: 0." appear in their diffs. 

imported/w3c/web-platform-tests/html/semantics/text-level-semantics/the-a-element/a-download-click-404.html
imported/w3c/web-platform-tests/html/semantics/text-level-semantics/the-a-element/a-download-click.html

https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fsemantics%2Ftext-level-semantics%2Fthe-a-element%2Fa-download-click-404.html&test=imported%2Fw3c%2Fweb-platform-tests%2Fhtml%2Fsemantics%2Ftext-level-semantics%2Fthe-a-element%2Fa-download-click.html

The change "Fix ServiceWorker downloads" (https://trac.webkit.org/changeset/286944/webkit) landed a few revisions before the first failure, and it added "test runner API to log the total download size", so it seems related.

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