2.1.6 [XML] Section 3.1, Start-Tags, End-Tags, and Empty-Element Tags

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V0007:

The specification states:

 Validity constraint: Attribute Value Type
 The attribute MUST have been declared; the value MUST be of the type declared 
 for it.

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

Attribute value types are not checked for validity.