2.1.16 [HTML5:2014] Section 4.2.4 The link element

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V0029: The sizes attribute is not supported

The specification states:

 4.2.4 The link element
     ...
     Content attributes
         Global attributes
         ...
         sizes — Sizes of the icons (for rel="icon")

All document modes (All versions)

The sizes attribute is not supported.

V0028: The crossorigin attribute is not supported

The specification states:

 4.2.4 The link element
     ...
     The crossorigin attribute is a CORS settings attribute. It is intended for use with 
     external resource links.

IE10 Mode and IE9 Mode (All versions)

The crossorigin attribute is not supported.