[Webkit-unassigned] [Bug 264158] New: Support devicePixelContentBoxSize with ResizeObserver

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=264158

            Bug ID: 264158
           Summary: Support devicePixelContentBoxSize with ResizeObserver
           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: gman at chromium.org

Created attachment 468470

  --> https://bugs.webkit.org/attachment.cgi?id=468470&action=review

example showing the need for devicePixelContentBoxSize

It's impossible to get the correct sizes for elements in Safari because it does not support devicePixelContentBoxSize with ResizeObserver

See attached example: it makes 3 elements each 33% the size of their parent

Asking the sizes via ResizeObserver or via getBoundingClientRect shows all 3 elements return the exact same size but take a screenshot measure and you'll see the center element is 200 device pixels where as the left and right elements are 199 device pixels

This is one of the things that devicePixelContentBoxSize is for.  Finding out the actual sizes of elements for pixel perfect rendering


Try it in Firefox or Chrome and they'll tell you the sizes via devicePixelContentBoxSize

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20231103/0b8acb21/attachment.htm>