Sometimes I'll create list items with nested child elements. A click's event.target may register on the nested element or the parent. This element prototype allows standardization of that.

getAncestorByTagName

	HTMLElement.prototype.getAncestorByTagName = function( tagName ) {
		var target = this;
		while ( target.tagName.toLowerCase() != tagName && target.tagName.toLowerCase() != 'body' ) {
			target = target.parentNode;
		}
		if ( target.tagName.toLowerCase() == 'body' ) {
			return false;
		} else {
			return target;
		}
		
	};