Create a message Happy Birthday in browser's console

console-happy-birthday.js

(function(){
	var text = "Happy Birthday, Steve!",
		length = text.length,
		chr = 1,
		ar = text.split(),
		today = new Date();
	try {
		if (window.console) {
			if (console.clear && console.log) {		
				if (today.getDate() === 17 && today.getMonth() === 2) {
					if (navigator.userAgent.search("Firefox") > -1) {
						console.log('%c'+text, 'color:red;font-size:1.5em');
					} else if (navigator.userAgent.search("Chrome") > -1) {
						for (var i=0; i < length; i++) {
							setTimeout(function () {
								console.clear();
								if (chr === length) {
									console.log('%c'+text.substring(0, chr), 'color:red;font-size:1.5em');
								} else {
							    	console.log('%c'+text.substring(0, chr)+'%c|', 'color:red;font-size:1.5em','color:black;font-size:1.5em');
								}
							    chr++ ;
							}, (150 * i)+10000);		
						}
					}
				}	
			}
		}	
	} catch (er) {
	}	
})();