ClickSurCaar
HTML
<canvas id='c1' onclick="clickSurCarre()"/>JavaScript
let canvas = document.getElementById('c1');
let ctx = canvas.getContext('2d');
ctx.fillStyle = '#4444CC';
ctx.fillRect(50, 25, 100, 100);
function clickSurCarre(){
alert("Quelqu'un a cliqué sur le carré !")
}