Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>This example calls a function to convert from Fahrenheit to Celsius:</p>
<p id="demo"></p>

<script>
function toCelsius(f) {
    return (5/9) * (f-32);
}
document.getElementById("demo").innerHTML = toCelsius(77);
</script>

</body>
</html>