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- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>Example</title>
- <style>
- body {
- height: 3000px;
- }
- .dot {
- width: 2px;
- height: 2px;
- background-color: black;
- position: absolute;
- }
- </style>
- </head>
- <body>
- <script>
- (function() {
- "use strict";
- document.onmousemove = handleMouseMove;
- function handleMouseMove(event) {
- var dot, eventDoc, doc, body, pageX, pageY;
- event = event || window.event; // IE-ism
- // If pageX/Y aren't available and clientX/Y
- // are, calculate pageX/Y - logic taken from jQuery
- // Calculate pageX/Y if missing and clientX/Y available
- if (event.pageX == null && event.clientX != null) {
- eventDoc = (event.target && event.target.ownerDocument) || document;
- doc = eventDoc.documentElement;
- body = eventDoc.body;
- event.pageX = event.clientX +
- (doc && doc.scrollLeft || body && body.scrollLeft || 0) -
- (doc && doc.clientLeft || body && body.clientLeft || 0);
- event.pageY = event.clientY +
- (doc && doc.scrollTop || body && body.scrollTop || 0) -
- (doc && doc.clientTop || body && body.clientTop || 0 );
- }
- // Add a dot to follow the cursor
- dot = document.createElement('div');
- dot.className = "dot";
- dot.style.left = event.pageX + "px";
- dot.style.top = event.pageY + "px";
- document.body.appendChild(dot);
- }
- })();
- </script>
- </body>
- </html>
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