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This was was cloned from bug 14709 as part of operation convergence. Originally filed: 2011-11-06 19:52:00 +0000 Original reporter: John Daggett <jdaggett@mozilla.com> This bug had 43 comments. For brevity, they are not repeated here.
The spec needs to be clarified that when it says to pass through the value unmodified, it should also include passing the type information ("This is supposed to be a BCP47 language code"), so that it's clear that if the next API is not also only limited to BCP47, there should be a defined mapping somewhere. I should probably explicitly include an example of how mapping lang="" to OpenType requires defining what to do with strings that aren't meaningful BCP47 codes but could be interpreted in other formats OpenType supports.
Checked in as WHATWG revision r7607. Check-in comment: Clarify how language codes are passed on to other tools. http://html5.org/tools/web-apps-tracker?from=7606&to=7607