[whatwg] hash Attribute

[Gervase Markham]

XcomCoolDude wrote:
> How about a hash attribute for all elements that link to external files 
> (a, img, etc.)?
> 
> It would allow you to pass an MD5, SHA-1, SHA-256, or other hash to a 
> user-agent for automatic comparison with the linked file.

A related proposal is:
http://www.gerv.net/security/link-fingerprints/

That proposal has the advantage that the hash can accompany the URL into 
non-HTML contexts.

> I'd suggest a format where the hash algorithm is listed, followed by a 
> forward slash and then the hash itself

To ease the implementation and interoperability burden, the smallest 
possible number of hash functions should be required to be supported.

Gerv