[Webkit-unassigned] [Bug 102936] New: Lookahead parser should evaluate Link header for rel=prefetch/stylesheet/script

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102936

           Summary: Lookahead parser should evaluate Link header for
                    rel=prefetch/stylesheet/script
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: nickshanks at nickshanks.com


Modern best practice is to put the scripts a page uses at the bottom of the document, as long as they do not use APIs like document.write()
Doing so requires that the look-ahead parser scan through an entire document before finding them. As an experiment, my web app now emits this:

HTTP/1.1 200 OK
Link:</style/common.min.css>;rel=stylesheet prefetch, </scripts/common.min.js>;rel=script prefetch

...response body...


however no difference above the statistical variance was noticed in the timing of speculative resource requests.

Anecdotal:
See http://stackoverflow.com/questions/3641581/link-rel-script-usage for comments about rel=script

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