[Webkit-unassigned] [Bug 255640] New: Declarative shadow DOM does not block rendering on <link> (browser inconsistency)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255640

            Bug ID: 255640
           Summary: Declarative shadow DOM does not block rendering on
                    <link> (browser inconsistency)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mic.gallego at gmail.com

Hi,

While trying the declarative shadow DOM, I found that Safari does not block rendering if it encounters a <link> external stylesheet, causing FOUC. Chrome, on the other hand, seems to block the rendering until the stylesheet is loaded.

I could not find on the spec which behavior is expected, but having inconsistent behavior makes it hard to properly implement a workaround. From a developer point of view, blocking is more desirable (the only way to avoid blocking is to load the stylesheet in the head in the global scope, which leak all the styles).

I've raised this concern as well in the W3C repo: https://github.com/whatwg/dom/issues/1187

Thanks.

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