Default value of "preload" attribute

The default value of "preload" is currently "auto". The definition of "auto"
is
"Hints to the user agent that the user agent can put the user's needs first
without risk to the server, up to and including optimistically downloading
the entire resource."

This seems like a hint that authors should opt into rather than being the
default. Authors who don't think about what they're doing may omit "preload"
on large media resources and find that everything's fine for a while, but
later users with faster, cheaper networks and more local storage connect and
download essentially unbounded quantities of media data. There are already
examples of pages with many media elements with no "preload" (or
"autobuffer") attribute. IMHO "metadata" would be a better default.

Rob
-- 
"He was pierced for our transgressions, he was crushed for our iniquities;
the punishment that brought us peace was upon him, and by his wounds we are
healed. We all, like sheep, have gone astray, each of us has turned to his
own way; and the LORD has laid on him the iniquity of us all." [Isaiah
53:5-6]