The readonly `this` binding applies to every element (and component) and allows you to obtain a reference to rendered elements. For example, we can get a reference to a `<canvas>` element:

``````<canvas
bind:this={canvas}
width={256}
height={256}
></canvas>``````

Note that the value of `canvas` will be `undefined` until the component has mounted, so we put the logic inside the `onMount` lifecycle function.