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<html><body><p>Peter's score: <meter id="myMeter" value="0.3" high="0.9" low="0.1" optimum="0.5"></meter></p><p>Click the button to return the value of the optimum attribute of the gauge above.</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { let x = document.getElementById("myMeter").optimum; document.getElementById("demo").innerHTML = x;}</script></body></html>