[Webkit-unassigned] [Bug 166355] New: `em` or `rem` based padding on elements stop scaling at certain point when zooming in

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166355

            Bug ID: 166355
           Summary: `em` or `rem` based padding on elements stop scaling
                    at certain point when zooming in
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vendivel at gmail.com
                CC: simon.fraser at apple.com

Created attachment 297607
  --> https://bugs.webkit.org/attachment.cgi?id=297607&action=review
Webkit render

Here's a link to test; try to zoom out (CMD and -)
https://jsfiddle.net/mven/1q5yqw4x/

`px` based padding relatively sizes down correctly, while the `em` and `rem` based ones stop scaling down at a certain point.

This happens on Both Chrome and Safari, including Webkit Nightly Build.

Firefox sizes all elements down correctly.

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