Mootools Element extras: isVisible and isHidden

Element.isVisibleHidden.js

/*
 * Inspired from http://github.com/jeresig/sizzle/commit/7631f9c3f85e5fa72ac51532399cb593c2cdc71f
 * and this http://github.com/jeresig/sizzle/commit/5716360040a440041da19823964f96d025ca734b
 */

Element.implement({

	isVisible: function(){
		var w = this.offsetWidth, h = this.offsetHeight;
		return (w===0 && h===0) ? false : (w>0 && h>0) ? true : this.getStyle('display') !== 'none';
	},

	isHidden: function(){
		var w = this.offsetWidth, h = this.offsetHeight;
		return (w===0 && h===0) ? true : (w!==0 && h!==0) ? false : this.getStyle('display') === 'none';
	}

});