| <!DOCTYPE html> |
| |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Simple Intersection Obsever</title> |
| <meta name="viewport" content="width=600"> |
| <link rel="stylesheet" href="styles.css"> |
| <script src="script.js"></script> |
| <style> |
| body { |
| font-family: Helvetica; |
| height: 6000px; |
| } |
| |
| #target { |
| position: absolute; |
| left: 60px; |
| width: 200px; |
| height: 200px; |
| top: 2800px; |
| padding: 40px; |
| box-sizing: border-box; |
| font-size: 24pt; |
| background-color: rgba(119, 104, 113, 1); |
| color: white; |
| text-align: center; |
| border-radius: 10px; |
| } |
| |
| body .root-margin { |
| position: fixed; |
| width: 100%; |
| height: 100%; |
| top: 0; |
| left: 0; |
| border: 50px solid rgba(0, 0, 0, 0.2); |
| box-sizing: border-box; |
| pointer-events: none; |
| } |
| </style> |
| <script> |
| var observer; |
| |
| function doSetup() |
| { |
| observer = new IntersectionObserver(intersectedCallback, { |
| threshold: [ 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 ], |
| rootMargin: '-50px' |
| }); |
| |
| let target = document.getElementById('target'); |
| observer.observe(target); |
| } |
| window.addEventListener('load', doSetup, false); |
| </script> |
| </head> |
| <body> |
| |
| <p>Scroll down to see the target</p> |
| <div class="results"> |
| <h2>Logging</h2> |
| <button onclick="clearLog()" class="clear">🗑</button> |
| <pre id="logging"></pre> |
| </div> |
| |
| <div id="target">Target</div> |
| |
| <div class="root-margin"></div> |
| |
| </body> |
| </html> |
