Add some missing things to dom.nim
Add some missing things to dom.nim

Add window.performance, window.performance.now(), window.devicePixelRatio, window.scrollX and Y, style.overflowX and Y, node.getBoundingRect.
dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim