Draw graphics using JavaScript:
<canvas id="myCanvas" width="400" height="200"></canvas>
<script>
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(20, 20, 150, 100);
</script>
SVG enables defining vector graphics:
<svg width="100" height="100">
<circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="red" />
</svg>