2.2.7 [HTML5:2014] Section 4.2.4 The link element

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

The specification states:

 4.2.4 The 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.

All document modes (All versions)

Resources are obtained as needed. Proactive fetching occurs only when a specific prefetch flag is set.

C0010: When necessary the image sniffing rules are used to determine the official type

The specification states:

 4.2.4 The link element
     ...
     ... Otherwise, if the resource is expected to be an image, user agents may apply the 
     image sniffing rules, with the official type being the type determined from the 
     resource's Content-Type metadata, and use the resulting ... type of the resource as 
     if it was the actual type. ...

All document modes (All versions)

When necessary the image sniffing rules are used to determine the official type.

C0008: There is no direct way for the user to access the hyperlinks created by the link element

The specification states:

 4.2.4 The link element
     ...
     Interactive user agents may provide users with a means to follow the hyperlinks 
     created using the link element, somewhere within their user interface. ...

All document modes (All versions)

There is no direct way for the user to access the hyperlinks created by the link element. However, there is programmatic access to the information through the link element itself.