W3School TIY Editor
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<!DOCTYPE html> <html> <body> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag. </canvas> <script> var c=document.getElementById("myCanvas"); var ctx=c.getContext("2d"); ctx.fillStyle="red"; ctx.fillRect(20,20,75,50); //Turn transparency on ctx.globalAlpha=0.2; ctx.fillStyle="green"; ctx.fillRect(50,50,75,50); ctx.fillStyle="blue"; ctx.fillRect(80,80,75,50); </script> </body> </html>