[Webkit-unassigned] [Bug 42154] New: Web Font is downloaded even when all the characters in a document are outside its unicode-range

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42154

           Summary: Web Font is downloaded even when all the characters in
                    a document are outside its unicode-range
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yuzo at google.com
                CC: mitz at webkit.org, hamaji at chromium.org,
                    hayato at chromium.org


http://dev.w3.org/csswg/css3-fonts/#unicode-range-desc says:
"User agents that download fonts for characters outside the defined unicode-range are considered non-conformant."

WebKit r63184 always downloads Web Fonts, even when all the characters are outside the unicode-range.
For example, in opening the following, WebKit downloads myfont.ttf, which it must not.

<style>
@font-face {
  font-family:myfont;
  src: url(myfont.ttf);
  unicode-range: U+FFFF;
}
</style>
<span style="font-family:myfont">
No characters here are in the unicode-range.
</span>

The behavior can be confirmed by either
- Setting a breakpoint at WebCore/css/CSSFontFaceSource.cpp:181,
- Checking the server log, or
- Monitoring the network traffic.

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