2.1.28 [W3C-HTML51] Section 22.214.171.124 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.