A simple centimeter, inches, and feet conversion and vice versa using JavaScript programming language.

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Program Listing

<html>
   <title>Centimeter, Inches, and Feet Conversion in JavaScript  </title>
 <style type="text/css">

 body {

 	font-family: arial;
 	font-weight: bold;
 	font-size:15px;
 	 }
 
 form
{
  display: inline-block;
  background-color: lightblue;
  padding: 6px;
}

label{
  display: block;
  direction: rtl; 
}

input{
  direction: ltr; 
}

label::after{
  content: attr(data-text);
}
 </style>

<script language="JavaScript">

function cmConverter(){
document.converter.inch.value = (document.converter.cm.value / 2.54).toFixed(2);
document.converter.feet.value = (document.converter.cm.value / 30.48).toFixed(2);
}
function inchConverter(){
document.converter.cm.value = (document.converter.inch.value * 2.54).toFixed(2);
document.converter.feet.value = (document.converter.inch.value / 12).toFixed(2);
}
function feetConverter(){
document.converter.cm.value = (document.converter.feet.value * 30.48).toFixed(2);
document.converter.inch.value = (document.converter.feet.value * 12).toFixed(2);
}

function Clear() {
document.converter.cm.value ="";
document.converter.feet.value="";
document.converter.inch.value="";
document.converter.cm.focus();
 
}

</script>
<body>
<br>
<h3>Centimeter, Inches, and Feet Conversion in JavaScript</h3>
<form name="converter">
<label data-text="Centimeter">&nbsp;&nbsp;	
<input type="text" name="cm" onChange="cmConverter()" required="">
</label>
<br />
<label data-text="Inches">&nbsp;&nbsp;
<input type="text" name="inch" onChange="inchConverter()" required="">
</label>
<br/>
<label data-text="Feet">&nbsp;&nbsp;<input type="text" name="feet" onChange="feetConverter()" required="">
</label>
<br /> <br>
<input type="button" value="Convert" title="Click here to convert." />
<input type="button" value="Clear"  
title="Click here to clear the text box."
onclick="Clear()"/>
</form>
</body>
</html>