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bug in intersection observer polyfill
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> | |
| <title>IntersectionObserver</title> | |
| <script src="https://cdn.polyfill.io/v2/polyfill.js?features=IntersectionObserver&min=false"></script> | |
| <style> | |
| html, body { | |
| padding: 0; | |
| margin: 0; | |
| height: 100%; | |
| } | |
| body { | |
| overflow-x: hidden; | |
| } | |
| .section { | |
| height: 50vh; | |
| background-color: #ccc; | |
| } | |
| .section:nth-child(odd) { | |
| background-color: #ddd; | |
| } | |
| #box { | |
| width: 400px; | |
| height: 150px; | |
| background-color: rebeccapurple; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <section class="section"></section> | |
| <section class="section"></section> | |
| <section class="section"> | |
| <!-- observed element --> | |
| <div id="box"></div> | |
| </section> | |
| <section class="section"></section> | |
| <script> | |
| const iO = new IntersectionObserver((observedElements) => { | |
| if (observedElements[0].intersectionRatio > 0) { | |
| console.log('observe the element', observedElements[0].intersectionRatio); | |
| } | |
| }, { | |
| threshold: [0.5], | |
| }); | |
| iO.observe(document.getElementById('box')); | |
| </script> | |
| </body> | |
| </html> |
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