The max property of the HTMLMeterElement interface represents the maximum value of the <meter> element as a floating-point number. It reflects the element's max attribute, or the min value if no max is set, or 1 if neither the min or the max is defined.
This property can also be set directly, for example to set a default value based on some condition.
A number.
<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.max); // 100
--meterElement.max;
console.log(meterElement.max); // 99