Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Floating point arithmetic is not always 100% accurate.</p>
<p>But it helps to multiply and divide.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var x = (0.2*10 + 0.1*10) / 10;
    document.getElementById("demo").innerHTML = "0.2 + 0.1 = " + x;
}
</script>

</body>
</html>