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Explain why `node instanceof Constructor` pattern can't be used for DOM node tests #37

Closed Yolijn closed 8 years ago

Yolijn commented 8 years ago

DOM.js has so many functions like isElement et cetera, and they all use node.nodeType == Node.ELEMENT_TYPE instead of node instanceof Element, without once explaining why this is necessary (constructors from other windows and browser compatibility, apparently).