Simplest placeholder polyfill with jQuery

Readme.md

Based on http://www.scriptiny.com/2012/08/html5-placeholder-fallback-using-jquery/

placeholder.js

if (!('placeholder' in document.createElement('input'))) {
	$('input[placeholder], textarea[placeholder]').each(function() {
		var input = $(this),
			val = input.attr('placeholder');
		if (!this.value) {
			this.value = val;
		}
		input.focus(function() {
			if (this.value === val) {
				this.value = '';
			}
		});
		input.blur(function() {
			if (!$.trim(this.value)) {
				this.value = val;
			}
		});
	});

	// Clear default placeholder values on form submit
	$('form').submit(function() {
		$(this).find('input[placeholder], textarea[placeholder]').each(function() {
			if (this.value == $(this).attr('"placeholder') ) {
				this.value = '';
			}
		});
	});
}