[Webkit-unassigned] [Bug 166757] New: macOS/OS X/iOS hyphenation API not returning all hyphenation points for CSS hyphens: auto

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166757

            Bug ID: 166757
           Summary: macOS/OS X/iOS hyphenation API not returning all
                    hyphenation points for CSS hyphens: auto
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mail at thomasbachem.com

Apple's hyphenation API seems to behave odd, leading to suboptimal hyphenation in Safari and Chrome on Mac/iOS, see previous discussion at https://bugs.chromium.org/p/chromium/issues/detail?id=677263.

Blink maintainer kojii states:

    OS X hyphenation API returns:
    "infrastructure" -> "in-frastructure"
    "frastructure" -> "fras-tructure"
    "tructure" -> "truc-ture"

Attached a specific test case. Results:

    Safari on Mac: "in-frastructure"
    Firefox on Mac: "infrastruc-ture" (own dictionary)
    Safari on Windows: "infrastruc-ture"

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