Platform-specific: no (checked MacOS 10.12, Ubuntu 16.04)
Steps to reproduce:
1. Open page with short (~1s) mp3 added to <audio> as source and play it
Expected result: even if the audio is short, slider should be at the end of the bar when playing is finished.
Actual result: slider doesn't move.
Sample audio attached.
That is really P4/P5 because using controls for 1s audio is not a good idea.