2.2.7 [W3C-HTML52] Section 4.2.4.3. Obtaining a resource from a link element

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C0009: Resources are obtained as needed unless a specific prefetch flag is set

The specification states:

 4.2.4.3. Obtaining a resource from a link element
     ...
     User agents may opt to only try to obtain such resources when they are needed, 
     instead of pro-actively fetching all the external resources that are not applied.

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Resources are obtained as needed unless a specific prefetch flag is set.