[Bug 28616] New: Feature testing for <link rel>

https://www.w3.org/Bugs/Public/show_bug.cgi?id=28616

            Bug ID: 28616
           Summary: Feature testing for <link rel>
           Product: HTML WG
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec
          Assignee: dave.null@w3.org
          Reporter: igrigorik@gmail.com
        QA Contact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-admin@w3.org,
                    public-html-wg-issue-tracking@w3.org

We need a way to test support for various <link rel> features - e.g. prerender,
prefetch, preload, preconnect.

Related threads:
- https://github.com/w3c/preload/issues/7
- https://lists.w3.org/Archives/Public/public-whatwg-archive/2015Apr/0000.html

Simon's proposal from the mailing list:

> For <link rel>, we could solve the feature-testing problem by normalizing the case for supported keywords but not unsupported keywords, so you can check with .rel or .relList:
>
> function preloadSupported() {
>    var link = document.createElement('link');
>    link.rel = 'PRELOAD';
>   return link.rel == 'preload';
> }

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Received on Thursday, 7 May 2015 05:45:26 UTC