We can either use JavaScript or jQuery. I have JavaScript example here below.
HTML
<label for="pwd_length">
<input type="range" name="pwd_length" id="pwd_length" min="8" max="64"
onchange="updatePwdLength(this.value);">
Password Length
<span id="pwd_length_div"></span>
</label>
JavaScript
var pwd_lengthElement = document.getElementById("pwd_length_div");
function updatePwdLength(ln) {
pwd_lengthElement.innerHTML = " (" + ln + ")";
}
See it in action:
html tags input range slider values