1799495-1.html - mozsearch

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<!DOCTYPE html>

<html>

<head>

    <script>

      window.addEventListener('load', async () => {

        const canvas1 = document.createElement('canvas')

        document.documentElement.appendChild(canvas1)

        const context1 = canvas1.getContext('2d')

        context1.globalCompositeOperation = 'destination-atop'

        const path = new Path2D()

        context1.fill(path, 'nonzero')

        const canvas2 = document.createElement('canvas')

        const context2 = canvas2.getContext('2d', {})

        await window.createImageBitmap(canvas1, 124, 233, 2147483647, 1, {})

        context2.filter = 'invert( 90% )'

        context2.fillRect(-1, -128, 4096, 1024)

})

    </script>

</head>

</html>