[Webkit-unassigned] [Bug 261649] New: CSS container-type does not work correctly on <html> element

Sat Sep 16 22:12:29 PDT 2023

https://bugs.webkit.org/show_bug.cgi?id=261649

            Bug ID: 261649
           Summary: CSS container-type does not work correctly on <html>
                    element
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Intel)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sime.vidas at gmail.com

Steps to reproduce: 

1. Use Safari on desktop
2. Switch to classic scrollbars (Appearance > Show scroll bars: Always)
3. Open https://codepen.io/simevidas/pen/bGOopaN?editors=0100
4. Click the “cause overflow” button

What should have happened: 

The gold bar should have decreased in width to fit into the smaller viewport width due to the classic scrollbar. That is what happens in Chrome and Firefox.

What happened:

The gold bar did not shrink and, as a result, it no longer fits into the viewport.

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