2.1.9 [XML] Section 3.2.2, Mixed Content

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V0010:

The specification states:

 Validity constraint: No Duplicate Types
  
 The same name MUST NOT appear more than once in a single mixed-content declaration.

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

More than one instance of an element type may appear in a single mixed-content declaration.