<!DOCTYPE html>
<html lang="en-US">
<body>
<form oninput="result.value=parseInt(a.value)+parseInt(b.value)" id="myForm">
<input type="range" name="b" value="50"> +
<input type="number" name="a" value="10"> =
</form>
<output name="result" form="myForm">60</output>
</body>
</html>