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<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<title>Mouse Drawing App</title>
	<style>
		canvas {
			border: 1px solid black;
		}
	</style>
</head>
<body>
	<canvas id="canvas" width="500" height="500"></canvas>

	<script>
		// get the canvas element
		var canvas = document.getElementById("canvas");

		// set up the drawing context
		var ctx = canvas.getContext("2d");

		// set initial variables
		var isDrawing = false;
		var lastX = 0;
		var lastY = 0;

		// add event listeners
		canvas.addEventListener("mousedown", startDrawing);
		canvas.addEventListener("mousemove", draw);
		canvas.addEventListener("mouseup", stopDrawing);
		canvas.addEventListener("mouseout", stopDrawing);

		// start drawing
		function startDrawing(e) {
			isDrawing = true;
			lastX = e.clientX - canvas.offsetLeft;
			lastY = e.clientY - canvas.offsetTop;
		}

		// draw
		function draw(e) {
			if (!isDrawing) return;
			var x = e.clientX - canvas.offsetLeft;
			var y = e.clientY - canvas.offsetTop;
			ctx.beginPath();
			ctx.moveTo(lastX, lastY);
			ctx.lineTo(x, y);
			ctx.stroke();
			lastX = x;
			lastY = y;
		}

		// stop drawing
		function stopDrawing() {
			isDrawing = false;
		}
	</script>
</body>
</html>