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Errors that involve areas that affect authors migrating to and from XHTML The spec says: "Some authors like to write files that can be interpreted as both XML and HTML with similar results. Though this practice is discouraged in general due to the myriad of subtle complications involved (especially when involving scripting, styling, or any kind of automated serialization), this specification has a few restrictions intended to at least somewhat mitigate the difficulties. This makes it easier for authors to use this as a transitionary step when migrating between HTML and XHTML." The spec should city the Polyglot Markup guide at http://www.w3.org/TR/html-polyglot/ for advice on creating these documents.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: see diff given below Rationale: Doing anything to encourage this kind of authoring especially linking to a spec that talks about how to do it! seems like a really bad idea to me, but ok.
Checked in as WHATWG revision r5610. Check-in comment: ref the polyglot spec http://html5.org/tools/web-apps-tracker?from=5609&to=5610