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This bug proposes the following new options for createImageBitmap()'s configuration dictionary (as proposed in bug 25639): double sourceX = 0 // change the origin of the extracted image in the source double sourceY = 0 // change the origin of the extracted image in the source double? sourceW = null // the width of the extracted image in the source double? sourceH = null // the height of the extracted image in the source
https://github.com/whatwg/html/issues/865