<!DOCTYPE html>
<html>
<head>
<title>My First HTML Page</title>
</head>
<body>
<p id='text'>This is some text …</p>
<button id='Bc'>Change Me</button>
<button id='Bh'>Hide Me</button>
<button id='Bf'>Find Me</button>
</body>
</html>
JavaScript
// Some Math work
var Two=2;
var Four=Two+Two;
var Two=Math.sqrt(Four);
var Circle_c=Math.PI*Four;
var Circle_A=Math.PI*Two*Two;
// User Interface (UI) code
document.getElementById('Bc').onclick=function(){
document.getElementById('text').innerHTML="The area of a circle with Diameter of Four units is "+Circle_A+" Units.";
};
document.getElementById('Bh').onclick=function(){
document.getElementById('text').style.display="none";
};
document.getElementById('Bf').onclick=function(){
document.getElementById('text').style.display="block";
};
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