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<text> dy attribute 'onload' SVGLengthList <text> getDy() in 'onload' getNumberOfItems SVGLengthList SVGLengthList text with insertItemBefore SVGLengthList SVGLengthList inserted point replaceItem SVGLengthList SVGLengthList replaced point removeItem SVGLengthList SVGLengthList intialized point appended point