2.1.37 [HTML5:2014] Section Seeking

V0077: The currentTime attribute updates asynchronously

The specification states:

 ... Seeking
     When the user agent is required to seek to a particular new playback position in the 
     media resource, optionally with the approximate-for-speed flag set, it means that the 
     user agent must run the following steps. ...
         ...  Set the current playback position to the ... new playback position.

All document modes (All versions)

The currentTime attribute updates asynchronously.