[Webkit-unassigned] [Bug 245415] New: worker (and other values) is a valid keyword for the value of as in link preload

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245415

            Bug ID: 245415
           Summary: worker (and other values) is a valid keyword for the
                    value of as in link preload
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: BrowserCompat
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karlcow at apple.com

When a document contains:

  <link rel="preload" href="main.js" as="worker" />

Safari reports:

  <link rel=preload> must have a valid `as` value


Probably a couple of tests are missing from 
https://wpt.fyi/results/html/syntax/speculative-parsing/generated/page-load?label=master&label=experimental&aligned&view=subtest&q=preload

or https://wpt.fyi/results/fetch/metadata/preload.https.sub.html?label=master&label=experimental&aligned&view=subtest&q=preload

or in 
https://wpt.fyi/results/preload/reflected-as-value.html?label=master&label=experimental&aligned&view=subtest&q=preload



The fetch spec definition:
https://fetch.spec.whatwg.org/#concept-request-destination

> A request has an associated destination, which is the empty string, "audio", "audioworklet", "document", "embed", "font", "frame", "iframe", "image", "manifest", "object", "paintworklet", "report", "script", "serviceworker", "sharedworker", "style", "track", "video", "worker", or "xslt". Unless stated otherwise it is the empty string.
> 
> A request’s destination is script-like if it is "audioworklet", "paintworklet", "script", "serviceworker", "sharedworker", or "worker".


It seems there are a couple of values which are not defined such as video for example.

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