Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Peter's score: <meter id="myMeter" min="0" low="40" high="75" max="100" value="65"></meter></p>

<p>Click the button to change the value of the min attribute of the gauge above.</p>

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

<p><b>Note:</b> The min property is not supported in Internet Explorer and Safari 5 (and earlier versions).</p>

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

<script>
function myFunction() {
    document.getElementById("myMeter").min = "20";
    document.getElementById("demo").innerHTML = "The value of the min attribute was changed from '0' to '20'.";
}
</script>

</body>
</html>