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Sections 1 Introduction and 5.2 Attribute-level namespaces mention xml: attributes including xml:space and xml:base in a way which suggests they occur in polyglot markup. But 7.1 Disallowed Attributes says, confusingly: The following attributes are not allowed in polyglot markup. These attributes have effects in documents parsed as XML but do not have effects in documents parsed as text/html. The HTML5 spec therefore defines them as invalid in text/html documents. [HTML5] xml:space xml:base Note that the xml:space and xml:base attributes are allowed on SVG and MathML elements. For internal consistency, and consistency with HTML5, shouldn't this be revised to read The following attributes are not allowed in polyglot markup except on foreign elements. These attributes have effects in documents parsed as XML but do not have effects in documents parsed as text/html outside of foreign elements. The HTML5 spec therefore defines them as invalid in text/html documents except on foreign elements. [HTML5] xml:space xml:base Submitted on behalf of the XML Core WG
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 Section 7.1 Disallowed Attributes