When text for the value of the timeline slider is long, the play/pause button can cover it up.

We have a few options:

1. Place the text for the slider below. (Probably not doable without making a custom slider).
2. Move the default button placement below the slider.
3. Make the button placement intelligent.

I am aiming for 2.

Also, it is worth considering adding a keyword argument that will move the button between the current placement and the new placement.