Tutorial - Video with Transport
A video can be played at different rates.
Define some HTML with the divs for the map and the transport controls.
In addition to CSS to have the map fill the page, also style the transport controls.
We load the video first so we can get its size and duration. It isn't possible to get the framerate, so we have to specify that.
Set up handling of the transport controls. Reverse speeds are complicated because HTML video doesn't support them natively.