Add audio/video fastSeek() method

[foolip]

No description provided.

[ddbeck]

Perhaps this should be something like:

Suggested change

	name: fastSeek()
	name: HTMLMediaElement fastSeek() method

To make the context more obvious and to be more consistent with the way we've done things for Array methods?

(I don't know if this also implies that we should rename this to htmlmediaelement-fastseek too.)

[foolip]

Consistency you say? How about checkVisibility() and scrollIntoView()?

For Array, in many cases the prefix is needed to distinguish arrays and types arrays, and the includes() method also exists on String and IDBKeyRange.

Also consider requestVideoFrameCallback() which is certainly long enough to stand on its own, and is on HTMLVideoElement, not HTMLMediaElement. Having "HTMLMediaElement fastSeek()" + "HTMLVideoElement requestVideoFrameCallback()" doesn't feel right to me, too much irrelevant technical detail.

I think the guideline I'm imagining is along the lines of "use the shortest plausible name except when ambiguous and when there's a group of related features, make the same choice for all of them for consistency within that group."

[ddbeck]

I think the guideline I'm imagining is along the lines of "use the shortest plausible name except when ambiguous and when there's a group of related features, make the same choice for all of them for consistency within that group."

OK, yes, I like the idea of using the shortest without creating ambiguity. I'll backtrack a little on #655 (comment) too.

[foolip]

Excellent, thank you! That discussion will continue in #548.

Are you happy (enough) with this name for now?

[ddbeck]

Yes, I'm satisfied now. I'll approve this PR, but I'll leave it to you to decide to merge or wait for Patrick's review.