<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <!doctype html> <html> <head> <meta charset="utf-8"/> <title>Web Audio Editor test page</title> </head> <body> <script type="text/javascript;version=1.8"> "use strict"; let ctx = new AudioContext(); let osc = ctx.createOscillator(); osc.frequency.value = 200; osc.disconnect(); </script> </body> </html>