From Emanuele Feronato: "One of the new Phaser 3 features is Matter.js, a 2D rigid body physics engine for the web written directly in JavaScript – this means it wasn’t ported from another language like it has been done with Box2D.
As usual, the first example of a physics engine is the “create a crate / remove a crate” script.
Touch the canvas in an empty spot to create a crate, or touch a crate to remove it."