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// accumulator is element a's height if possible.
// current value is element b's height that is being compared to element a
// if b is not an element, it will be 0

function getTallestElement(elements) {
	return elements.reduce(function(a,b) {

		a = a.offsetHeight || a;
		b = b.offsetHeight || 0;

		return Math.max(a, b);
	}, 0);
}