Perelandric

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Perelandric

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Object.assign()


Polyfill: IIFE is superfluous. Function length was wrong. Separate checks for null/undefined are unnecessary when == can be used. The hasOwnProperty can be shadowed, so we shouldn't rely on the prototype chain. Variable names are closer to spec.

MouseEvent.clientY


Compatibility tested at least as far back as FF2.

MouseEvent.clientX


Compatibility tested at least as far back as FF2.

Array.prototype.map()


IE does not support any of the ES5-specific Array methods until version 9.