The high property of the HTMLMeterElement interface represents the high boundary of the <meter> element as a floating-point number. It reflects the element's high attribute, or the value of max if not defined. The value of high is clamped by the low and max values.
This property can also be set directly, for example to set a default value based on some condition.
A number that is not less than HTMLMeterElement.low nor greater than HTMLMeterElement.max.
<label for="fuel">Current fuel level:</label>
<meter
id="fuel"
min="0"
max="100"
low="15"
high="66"
optimum="80"
value="50"></meter>const meterElement = document.getElementById("fuel");
console.log(meterElement.high); // 66
++meterElement.high;
console.log(meterElement.high); // 67