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"Let width be the result of getting a property named width from the parameters argument. Let height be the result of getting a property named height from the parameters argument. Set the width, in CSS reference pixels, of the operating system window containing the current top-level browsing context, including any browser chrome and externally drawn window decorations to a value that is as close as possible to width. " This doesn't account for the possibility of width or height being non-numbers (in particular undefined, which might mean only set width or only set height).