[Webkit-unassigned] [Bug 149157] New: Allow the page to render before <link> stylesheet tags in body

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=149157

            Bug ID: 149157
           Summary: Allow the page to render before <link> stylesheet tags
                    in body
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jaffathecake at gmail.com

Test page: https://wiki-offline.jakearchibald.com/wiki/Hulk_Hogan?use-url-flags&prevent-sw=1&no-css-async-hack=1

Results:
Chrome http://www.webpagetest.org/video/compare.php?tests=150424_57_12PJ-r:1-c:0
IE http://www.webpagetest.org/video/compare.php?tests=150424_NH_12XE-r:1-c:0

In the test above, the page has inline CSS, 'defer'd javascript, then the HTML for the top toolbar. After the toolbar, there's a <link> for some CSS (load.php in the waterfall), followed by the article content.

In Chrome/Safari, the preparser discovers the CSS and blocks further rendering, including content before the <link>. IE will allow content before the <link> to render, and block afterwards. Firefox is similar to IE

The spec is unclear here, but developers seem to want this behaviour https://www.w3.org/Bugs/Public/show_bug.cgi?id=27303#c37, and there are hacks to work around the current block-everything behaviour https://github.com/filamentgroup/loadCSS

Chrome is looking to align with Firefox & IE on this https://code.google.com/p/chromium/issues/detail?id=481122#c17

Further explanation of the problem & benefits of this solution https://www.w3.org/Bugs/Public/show_bug.cgi?id=27303#c36

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