Steven Englehardt writes:

> While it may have been
> theoretically possible for all trackers to gather statistics on video
> playback for each configuration, the only scripts that could practically
> carry out those attacks without degrading user experience would have been
> video providers. This will be especially true if browsers start blocking
> autoplay by default (https://bugzilla.mozilla.org/show_bug.cgi?id=1376321),
> since users will never interact with media elements from fingerprinting
> scripts. [...]

> If autoplay is eventually blocked by default could we gate the response of
> this API on user interaction with the media element?

Note that current playback blocking work is focused on media
elements that produce audio.  Video-only elements would not be
affected.

The blocking is also gated by interaction with the document,
rather than any particular element.

(There may be other non-default behaviors available.)
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