[Webkit-unassigned] [Bug 168533] New: Font Loading API specifies font is loaded but sizing of font after load reports inconsistent values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168533

            Bug ID: 168533
           Summary: Font Loading API specifies font is loaded but sizing
                    of font after load reports inconsistent values
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ssaviano at google.com
                CC: mmaxfield at apple.com

jsfiddle: https://jsfiddle.net/0ko9fLwo/1/

Refresh that page and look at the JS console. It repros via refresh/cmd-R.

Steps:
1) Create a new FontFace object with fallbacks in the source string on page load
2) Load the FontFace
3) Add to documents.fonts
4) Monitor sizing of text with the font

Expected: Element size stays consistent post FontFace load

Actual: Element size has one value and then another post FontFace load. 

Occurs on:
a) Version 10.0.2 (12602.3.12.0.1)
b) Release 23 (Safari 10.2, WebKit 12604.1.5)


It appears this has to do with fallbacks in the font source strings (and potentially that this is done in the initial page load). If the font source string is only the remote url, then the sizing inconsistency does not occur.
https://jsfiddle.net/6eshwbuc/1/

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