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<html><body><h1>HTML5 Canvas</h1><h2>The addColorStop() Method</h2><canvas id="myCanvas" width="300" height="150" style="border:1px solid grey"></canvas><script>const c = document.getElementById("myCanvas");const ctx = c.getContext("2d"); const grd = ctx.createLinearGradient(0, 0, 170, 0);grd.addColorStop(0, "black");grd.addColorStop("0.3", "magenta");grd.addColorStop("0.5", "blue");grd.addColorStop("0.6", "green");grd.addColorStop("0.8", "yellow");grd.addColorStop(1, "red"); ctx.fillStyle = grd;ctx.fillRect(20, 20, 150, 100);</script></body></html>