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20 lines
708 B
HTML
20 lines
708 B
HTML
<!DOCTYPE html>
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<html>
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<head>
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<script>
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window.addEventListener('load', async () => {
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const canvas1 = document.createElement('canvas')
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document.documentElement.appendChild(canvas1)
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const context1 = canvas1.getContext('2d')
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context1.globalCompositeOperation = 'destination-atop'
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const path = new Path2D()
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context1.fill(path, 'nonzero')
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const canvas2 = document.createElement('canvas')
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const context2 = canvas2.getContext('2d', {})
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await window.createImageBitmap(canvas1, 124, 233, 2147483647, 1, {})
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context2.filter = 'invert( 90% )'
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context2.fillRect(-1, -128, 4096, 1024)
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})
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</script>
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</head>
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</html> |