Jumping exactly when you hit the ground on a slab cancel falling damage (respawn invulnerability)

If you fall from a height where you should receive damages (for example : 30 blocks), and the floor you hit on impact is a slab, it is possible to cancel fall damage by jumping just when you hit the floor.

Here is a video example : https://www.youtube.com/watch?v=DDCE4jZQtsg&feature=youtu.be