<!DOCTYPE html> <html lang="en-PH"> <head> <meta charset="UTF-8"> <title>Audio Interval Test</title> <style> label { position: relative; } label > span { position: absolute; left: -999999px; } label + input[type="checkbox"] { position: absolute; left: -999999px; } </style> </head> <body> <form id="formAudio"> <fieldset> <legend> Repeating Sounds </legend> <div> <label> <span>Interval (bpm)</span> <input type="number" name="interval" value="750" min="100" max="1000" /> </label> <input type="checkbox" name="play" readonly tabindex="-1" checked /> </div> <div> <label> <span>Interval (ms)</span> <output>-</output> </label> </div> <button type="submit"> Toggle Sound </button> </fieldset> </form> <script src="index.js"></script> </body> </html>