[Webkit-unassigned] [Bug 78616] New: Consider formulating RenderReplaced as an effect of shadow DOM

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78616

           Summary: Consider formulating RenderReplaced as an effect of
                    shadow DOM
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dglazkov at chromium.org
                CC: rniwa at webkit.org, dominicc at chromium.org,
                    hayato at chromium.org, morrita at google.com,
                    shinyak at chromium.org
            Blocks: 63606


>From discussion on bug 50126, Niwa-san suggested a pretty nifty idea: what if we re-describe all elements that currently rely on RenderReplaced for rendering as elements with a shadow DOM (created by UA), that looks like this--taken from Ryosuke's comment:

HTMLCanvasElement -> ShadowRoot -> some-special-element/renderer, inaccessible from ES5
|
v
fallback contents (accessible from DOM, focus, etc... would just work when shown)

This would solve nicely the fallback content issues with focus and possibly allow us to replace RenderReplaced with a better-defined shadow DOM logic.

Also, this dovetails pretty well into https://www.w3.org/Bugs/Public/show_bug.cgi?id=15802.

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