[Webkit-unassigned] [Bug 237273] Implement focus fixup rule

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237273

Tim Nguyen (:ntim) <ntim at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rniwa at webkit.org

--- Comment #1 from Tim Nguyen (:ntim) <ntim at apple.com> ---
Adding this seems to work:

```
        if (auto* activeElement = document.activeElement()) {
            if (!activeElement->isFocusable())
                document.setFocusedElement(nullptr);
        }
```

I put it in the RenderingUpdateStep::FlushAutofocusCandidates block, but that's probably not the right place (not sure which one is?).

One thing that's broken is interaction with shadow DOM: shadow-dom/focus/focus-pseudo-on-shadow-host-1.html fails. This is precisely because activeElement->isFocusable() doesn't take in account contents of the shadow DOM, and wrongly clears focus in this case. Though I expect that's not too hard to fix.

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