[Webkit-unassigned] [Bug 219005] New: Implement ResizeObserver's devicePixelContentBox

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219005

            Bug ID: 219005
           Summary: Implement ResizeObserver's devicePixelContentBox
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kbr at google.com

ResizeObserver has gained the ability to observe the number of device pixels that a given element covers in the "device-pixel-content-box" observation:
https://www.w3.org/TR/resize-observer/#dom-resizeobserverboxoptions-device-pixel-content-box

This feature was discussed and specified in the CSS working group. Some concerns were raised by WebKit engineers at the time that WebKit can only provide an accurate answer for this observation after, and not before, the paint cycle runs. Even with this concern, this feature is important for web applications that expect to be able to do pixel-accurate rendering.

Now that WebKit has ResizeObserver support (thanks to Igalia folks for implementing it!), would it be possible to do at least a first-cut implementation of this new observation? It should make the example in the article https://web.dev/device-pixel-content-box/ render more stably. Currently it shows bad moiré effects in Safari Technology Preview on Retina display MacBook Pros.

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