left hand assignment ftw

placeholder-ie-polyfill.js

/* ie placeholders */
$('[placeholder]').on('focus blur', function() {
	var h = this.getAttribute('placeholder'), v = this.value;
	this.value = !v && h || ((v != h) && v || '');
}).trigger('blur');

vanilla-placeholder-ie-polyfill.js

(function(d) {
	for(var p = d.querySelectorAll('[placeholder]'), l = 0; l < p.length; l++) {
		for(var a = (d.attachEvent ? 'attachEvent' : 'addEventListener'), c = ['focusin', 'focusout'], e = 0; e < c.length; e++) {
			if(a.match(/t$/)) c[e] = 'on' + c[e];
			p[l][a](c[e], (function(f) {f = function(o) {
					var s = (o == this ? o : window.event.srcElement);
						h = s.getAttribute('placeholder'), v = s.value;
					s.value = !v && h || ((v != h) && v || '');
				}
				return (e < 1 && f.apply(p[l],[p[l]])) || f;
			})(), false)
		}
	}
}(document))()