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Re: [csswg-drafts] [css-sizing-4] Clarify spec about when elements are allowed to not have a last remembered size (#6220)

From: Oriol Brufau via GitHub <sysbot+gh@w3.org>
Date: Sat, 01 May 2021 23:58:40 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-830711439-1619913519-sysbot+gh@w3.org>
No strong opinion, but maybe I would even expect to remove the last remembered size during the first layout after removing `auto`, even if there hasn't been any `ResizeObserver` opportunity.

```js
// Assume last remembered size is 100px
element.style.containIntrinsicSize = "none";
element.offsetLeft; // Forces sync layout, clears remembered size?
element.style.containIntrinsicSize = "auto 0px"; // Re-add "auto" before ResizeObserver opportunity
element.style.contain = "size";
```

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