[Webkit-unassigned] [Bug 93832] New: text-combine falls back to none rather than scale when wider than 1.1em

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93832

           Summary: text-combine falls back to none rather than scale when
                    wider than 1.1em
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kojiishi at gmail.com


CSS Writing Modes Level 3 has the text-combine-mode property, and its initial value defines:
  If the contents are wider than 1em, the UA must attempt to fit
  the contents within 1em, but may use any method to do so.
http://dev.w3.org/csswg/css3-writing-modes/#text-combine-mode

Current behavior of WebKit is from old WD:
  The UA may scale the contents to fit instead, or in addition to the method above.
http://www.w3.org/TR/2011/WD-css3-writing-modes-20110531/#text-combine

Note "may scale" was changed to "must attempt to fit" in the current WD. WebKit's current implementation chose to fallback to "none" if wider than 1.1em, but this behavior is no longer conformant.

This issue has been controversial, but after a long discussion, Adobe, W3C I18N WG JLTF, and EPUB Japan ML all agree with the current WD behavior, and it was resolved at CSS WG F2F, so the editors of the spec consider that this is stable now.

Authors and publishers are making feedback that falling back to none is hard to accept, some are using span + writing-mode: horizontal-tb to avoid this. Changing the behavior to follow the new WD is important for authors and publishers.

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