[whatwg] default values stepDown() and stepUp() methods

[Scott González]

The stepDown() and stepUp() methods both take a single parameter to define
how many steps should be taken. There is currently no default value for this
parameter which means calling element.stepUp() takes zero steps, which
essentially means that it performs no action at all. I think the parameter
should default to 1 as that will probably be a very common use. Everyone I
have talked to agrees that defaulting to zero steps is not the behavior they
expect.
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