[Webkit-unassigned] [Bug 210432] New: ResizeObserver contentRect gives incorrect measurements when Safari is not at 100% zoom level

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210432

            Bug ID: 210432
           Summary: ResizeObserver contentRect gives incorrect
                    measurements when Safari is not at 100% zoom level
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lukesideris at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 396293

  --> https://bugs.webkit.org/attachment.cgi?id=396293&action=review

screenshot illustrating ResizeObserver.contentRect issue

Codepen to demonstrate issue: https://codepen.io/lukesideris/pen/oNjXmoJ

When safari is zoomed in or out the value of ResizeObserver.contentRect returns the elements size after the zoom level is applied. This causes problems with measuring and aligning content because the actual height (getClientBoundingRect for instance) of the element is not the same as the rendered height.

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