Created
September 5, 2020 16:23
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <title>Aspect Ratio Custom Property</title> | |
| <script type=module> | |
| // Run on load, resize, and 'reprocess' events | |
| [ | |
| 'load', | |
| 'resize', | |
| 'reprocess' | |
| ].forEach(eventType => | |
| window.addEventListener(eventType, processAspectRatioProperties) | |
| ) | |
| // Our runtime for supporting --aspect-ratios | |
| function processAspectRatioProperties() { | |
| document.querySelectorAll('*').forEach(tag => { | |
| const aspectRatio = window.getComputedStyle(tag).getPropertyValue('--aspect-ratio') | |
| if (aspectRatio !== "") { | |
| const [width, height] = aspectRatio.split('/') | |
| tag.style.height = `${ | |
| tag.getBoundingClientRect().width / (width / height) | |
| }px` | |
| } | |
| }) | |
| } | |
| </script> | |
| <style> | |
| /* Set in CSS */ | |
| .square { | |
| background: lime; | |
| --aspect-ratio: 1/1; | |
| } | |
| [style*="--aspect-ratio"] { | |
| background: hotpink; | |
| } | |
| </style> | |
| <!-- Set in CSS --> | |
| <div class=square>Square</div> | |
| <!-- Set in DOM --> | |
| <div style="--aspect-ratio: 16/9">Sixteen by Nine</div> |
Author
tomhodgins
commented
Sep 5, 2020
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