| <!DOCTYPE html> |
| <style> |
| #target { |
| width: 200px; |
| height: 200px; |
| } |
| @keyframes expand { |
| 0% { --foo: 10; } |
| 100% { --foo: 200; } |
| } |
| .animate { |
| background-image: paint(shdow); |
| animation: expand 1s; |
| } |
| </style> |
| <div id="target"></div>; |
| <script id="code" type="text/worklet"> |
| registerPaint('shadow', class { |
| static get inputProperties() { return ['--foo']; } |
| paint(ctx, geom, properties) { |
| let fooValue = parseFloat(properties.get('--foo').toString()); |
| ctx.fillStyle = 'green'; |
| ctx.fillRect(0, 0, fooValue, fooValue); |
| } |
| }); |
| </script> |
| |
| <script> |
| CSS.registerProperty({ |
| name: '--foo', |
| syntax: '<number>', |
| initialValue: '10', |
| inherits: false |
| }); |
| </script> |
| |
| <script> |
| var code = document.getElementById('code').textContent; |
| var blob = new Blob([code], {type: 'text/javascript'}); |
| CSS.paintWorklet.addModule(URL.createObjectURL(blob)).then(function() { |
| document.getElementById('target').classList.add('animate'); |
| }); |
