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Re: [csswg-drafts] [cssom-view] [css-overflow] Document.scrollingElement doesn't reflect viewport propagation correctly in presence of overflow: clip (#5601)

From: CSS Meeting Bot via GitHub <sysbot+gh@w3.org>
Date: Wed, 11 Nov 2020 17:40:14 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-725562407-1605116413-sysbot+gh@w3.org>
The CSS Working Group just discussed `[cssom-view] [css-overflow] Document.scrollingElement doesn't reflect viewport propagation correctly in presence of overflow: clip`, and agreed to the following:

* `RESOLVED: For quirks mode only the scrolling element should follow same propagation as the overflow:clip`

<details><summary>The full IRC log of that discussion</summary>
&lt;dael> Topic: [cssom-view] [css-overflow] Document.scrollingElement doesn't reflect viewport propagation correctly in presence of overflow: clip<br>
&lt;dael> github: https://github.com/w3c/csswg-drafts/issues/5601<br>
&lt;dael> emilio: The overflow prop section in css overflow and docuement.scollingelement disagree. document.scrollingelement returns the body if overflow was prop from it. That's not what it does if account for overflow:clip<br>
&lt;Rossen_> q?<br>
&lt;dael> emilio: Fix is simple but may be we want to change overflow prop behavior<br>
&lt;dael> chish: Are you saying in the issue example scrolling elements should be html not body?<br>
&lt;dael> emilio: Yes b/c overflow is hidden effectively. Not visible. it propg as hidden to the viewport<br>
&lt;dael> chrishtr: Yep.<br>
&lt;dael> s/chish/chrishtr<br>
&lt;dael> Rossen_: Your pop is to go with fix the bug or change overflow propg behavior?<br>
&lt;dael> emilio: Change scrolling element to match overflow propg<br>
&lt;fantasai> wfm<br>
&lt;dael> emilio: afaict that's what Gecko does<br>
&lt;dael> smfr: Change scrolling elmenet for overflow clip so it matches overflow:hidden on root<br>
&lt;dael> emilio: Right<br>
&lt;dael> emilio: That's what css overflow requires<br>
&lt;dael> emilio: Overflow:clip behaves same as hidden in the test case<br>
&lt;dael> smfr: What is scrolling lement not in quirks?<br>
&lt;dael> emilio: document.element<br>
&lt;dael> smfr: sounds good<br>
&lt;dael> chrishtr: agreed<br>
&lt;dael> Rossen_: Prop: For quirks mode only the scrolling element should follow same propg as the overflow:clip<br>
&lt;dael> RESOLVED: For quirks mode only the scrolling element should follow same propagation as the overflow:clip<br>
</details>


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