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<canvas> is not supported
IE 8 does not support <canvas> and does not provide HTMLCanvasElement interface. If using document.createElement('canvas'), It will transform it to HTMLGenericElement and does not provide any method of <canvas>, i.e. getContext().
Reserve words can not be used in object property
IE 8 will throw error if using reserve words to define object properties. For examples, var a = { delete: 'delete' } will throw error.