[Webkit-unassigned] [Bug 183666] New: Safari fails to load dynamic stylesheets

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=183666

            Bug ID: 183666
           Summary: Safari fails to load dynamic stylesheets
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: All
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shimon.schwartz at cbsinteractive.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 335862

  --> https://bugs.webkit.org/attachment.cgi?id=335862&action=review

Example

Summary:
Safari fails to load a stylesheet via a link tag that was modified at the runtime. 

Steps to Reproduce:
1. create a blank html5 page 
2. add a <link rel="preload" as="style" href="{ stylesheet url }"> tag
3. add a script that executes on window load event, which updates the above tag rel attribute to "stylesheet"

See attached code as an example.

Expected Results:
CSS loads and is applied to the page

Actual Results:
CSS never loads

This works on Safari 11.0 and older, and on all other browsers

Version/Build:
Safari 11.1 beta 4, both desktop and iOS

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