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<!DOCTYPE html> <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 change the value of the optimum attribute of the gauge above.</p> <button onclick="myFunction()">Try it</button> <p><b>Note:</b> The optimum property is not supported in Internet Explorer and Safari 5 (and earlier versions).</p> <p id="demo"></p> <script> function myFunction() { document.getElementById("myMeter").optimum = "0.7"; document.getElementById("demo").innerHTML = "The value of the optimum attribute was changed from '0.5' to '0.7'."; } </script> </body> </html>