[Webkit-unassigned] [Bug 76262] StyleRecalc should occur when shadow root exists and light children are changed.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=76262





--- Comment #11 from Shinya Kawanaka <shinyak at chromium.org>  2012-01-25 23:29:44 PST ---
I was investigating why anonymous RenderBlock was created today.

Let's consider the following. 
<div>foo<div>bar</div></div>

This will create renderer tree like the following:
RenderBlock
    RenderBlock (anonymous)
         RenderText                    <-- (1)
    RenderBlock {DIV}               <-- (2)
         RenderText

When (1) is removed, the parent RenderBlock is not deleted. If (2) is removed, the previous anonymous RenderBlock is deleted.

Also, let's consider the following.
<div>foo<div>bar</div>baz</div>

RenderBlock
    RenderBlock (anonymous)
         RenderText
    RenderBlock {DIV}
         RenderText
    RenderBlock (anonymous)
         RenderText

When foo and baz are removed, these anonymous RenderBlock won't be removed. When DIV is deleted, 
those anonymous RenderBlocks are merged, then removed.

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