[Webkit-unassigned] [Bug 213236] New: Browser reports wrong element size

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213236

            Bug ID: 213236
           Summary: Browser reports wrong element size
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roland at nextendweb.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Steps to reproduce:

- Attach the iPhone or iPad to your Mac and inspect the current tab
- Navigate this tab to: https://smartslider3.com/bugs/webkit/wrongheight/
- Examine the console - values are: el, jQuery->outerHeight(), jQuery->height(), el.getBoundingClientRect(), el.clientHeight, el.scrollHeight


All height value should be 800 and width in getBoundingClientRect() should be 1440

What went wrong?
At first load the browser reports wrong values. on my iPhone 11 it reports 1065px for the height and 414px for the width.

Debugger stopped right after the console log. If you use the console in this paused state and try to print out values for the very same element, it will report the right values.


Note: This only happens on the first load. Clear the whole cache to reproduce it again. Or enter private mode, open the page, to refresh close the tab and open a new tab. 

Happens on IOS 13.5, and IOS 12.9

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