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See discussion in https://github.com/whatwg/html/pull/7079. Including the effects of that PR, focusing and unfocusing (e.g. via focus() and blur()) a delegatesFocus shadow host uses the flat tree: given #474

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966563058015 opened this issue Oct 13, 2021 · 1 comment
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See discussion in https://github.com/whatwg/html/pull/7079. Including the effects of that PR, focusing and unfocusing (e.g. via focus() and blur()) a delegatesFocus shadow host uses the flat tree: given #474

966563058015 opened this issue Oct 13, 2021 · 1 comment

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@966563058015
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966563058015 commented Oct 13, 2021 •
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See discussion in whatwg/html#7079. Including the effects of that PR, focusing and unfocusing (e.g. via focus() and blur()) a delegatesFocus shadow host uses the flat tree: given

<!doctype html>
<div id="host">
  <div tabindex=0>In light tree</div>
</div>
<script>
  let host = document.getElementById("host");
  host.attachShadow({ mode: "open", delegatesFocus: true }).innerHTML = `
    <slot></slot>
    <div tabindex=0>In shadow tree</div>
  `;
  host.focus();
</script>

the <div> will be focused, and if you insert host.blur() afterward, the div will be blurred.

@emilio states

I find delegating focus to stuff outside the shadow tree a bit weird, because you call focus(), the focus changes, but activeElement is not the host, and the host doesn't match :focus either.

I'm not sure why delegatesFocus was specified to look for focusable elements using the flat tree rather than the shadow-including tree of the shadow root, seems really weird.

which I tend to agree with. Recall that the main use cases for delegatesFocus are things like <input type="date"> where you want to focus things in the shadow DOM, not the light DOM.

__Originally posted by @domenic in whatwg/html#7207
@pcihon
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pcihon commented Oct 13, 2021

Hi @966563058015, I'm closing this as off topic. Please see our Contributing.md for the types of feedback we're looking for on our Site Policies in this repo.

@pcihon pcihon closed this as completed Oct 13, 2021
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