Suggested bug in input step base defn.

>From http://code.google.com/p/chromium/issues/detail?id=161473

When an input has no @min, the step base should be the @value, before
resorting to default step base for that type, then step base of zero.

e.g. <input type=number value=5 step=10>

Expected permitted values: …, –5, 5, 15, 25, 35, …
Permitted values according to base step rule: …, –10, 0, 10, 20, 30, …

Without this, an unmodified form (with values as sent from server) cannot
be submitted.


-- 
Nicholas.