Re: [csswg-drafts] [resize-observer] In shipping browsers, observe() doesn't call unobserve() (#12902) from Oriol Brufau via GitHub on 2025-10-03 (public-css-archive@w3.org from October 2025)

From: Oriol Brufau via GitHub <noreply@w3.org>
Date: Fri, 03 Oct 2025 23:31:26 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-3367542681-1759534284-noreply@w3.org>

https://searchfox.org/firefox-main/rev/dcdbc805276cd5bf131cac2dbf53dda1538a32d5/dom/base/ResizeObserver.cpp#278-284 has this explanation:

```
      // Already observed this target and the observed box is the same, so
      // return.
      // Note: Based on the spec, we should unobserve it first. However,
      // calling Unobserve() when we observe the same box will remove original
      // ResizeObservation and then add a new one, this may cause an unexpected
      // result because ResizeObservation stores the mLastReportedSize which
      // should be kept to make sure IsActive() returns the correct result.
```

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Received on Friday, 3 October 2025 23:31:27 UTC