[Webkit-unassigned] [Bug 103467] New: Improve webfonts download algorithm

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103467

           Summary: Improve webfonts download algorithm
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bashi at chromium.org


https://bugzilla.mozilla.org/show_bug.cgi?id=510439#c6 says that Chrome fetches unnecessary webfonts for the following test cases:

- http://people.mozilla.org/~jkew/lazy-fontface-2a.html
font-family list is "Sevillana, Siemreap, GFS Diot".
Sevillana has glyphs for basic Latin so Siemreap and GFS Didot should not be downloaded.

- http://people.mozilla.org/~jkew/lazy-fontface-2b.html
font-family list is "Siemreap, Sevillana, GFS Diot".
Siemreap doesn't have glyphs for basic Latin, so we should download Siemreap first, then download Sevillana. GFS Diot should not be downloaded.

Chrome download all three webfonts for both 2a and 2b.

I confirmed that Safari has the same problem.

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