for example, this page has a penetrating click:
http://animejs.com/
canvas at the top, mouse clicks will animate, but this will cover the dom elements below.
after my local test filled the full screen with canvas, the a tag on the page was unclickable.
that is, the effect is that the click of the canvas does not conflict with the click of the dom element on the page, for example, the mouse over the a tag will still appear underlined, as if the canvas does not exist.
how is this URL realized?