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index.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>
0 - Counter
</title>
<style>
body{
font-family: sans-serif;
text-align: center;
}
h1{
font-size: 5em;
line-height: 1em;
font-weight: normal;
cursor: pointer;
}
p{
font-size: 21px;
line-height: 25px;
margin: 0px;
}
</style>
</head>
<body>
<h1 id="counter">0</h1>
<p>Press enter or click anywhere to increment.</p>
<p>Press delete or ctrl+click to decrement.</p>
</body>
<script type="text/javascript">
var counter = 0;
var counterElement = document.getElementById("counter");
function increment(){
counter++;
counterElement.innerHTML = counter;
document.title = counter + " - Counter";
}
function decrement(){
counter--;
counterElement.innerHTML = counter;
document.title = counter + " - Counter";
}
document.onkeypress = function(event) {
var key = event.keyCode || event.which;
if(key == 13){
increment();
} else if(key == 127){
event.preventDefault();
decrement();
}
}
document.onmousedown = function(e){
e.preventDefault();
return false;
}
document.onclick = function(e){
if(e.ctrlKey){
decrement();
} else {
increment();
}
}
</script>
</html>