[Webkit-unassigned] [Bug 255402] New: WebKit fails to spawn subworkers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255402

            Bug ID: 255402
           Summary: WebKit fails to spawn subworkers
           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: tomac at google.com

Created attachment 465890

  --> https://bugs.webkit.org/attachment.cgi?id=465890&action=review

Safari Console

A Web Worker can spawn other Web Workers; these are sometimes referred to as subworkers or sub-workers. Safari does not seem to request the subworker file and only spawns a Worker from the main thread.

Note the screenshots:

chrome.png: The expected behavior in Chrome.
firefox.png: The expected behavior in Firefox.
safari-console.png: Safari only logs the message from worker.js.
safari-network.png: Safari does not seem to make the request for subworker.js.
safari-sources.png: Safari does not show subworker.js in its sources.

Minimal repro: https://safari-subworker.glitch.me/

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