Listen to your web pages

plink-plonk.js

/*
Copy this into the console of any web page that is interactive and doesn't
do hard reloads. You will hear your DOM changes as different pitches of
audio.

I have found this interesting for debugging, but also fun to hear web pages
render like UIs do in movies.
*/

const audioCtx = new (window.AudioContext || window.webkitAudioContext)()
const observer = new MutationObserver(function(mutationsList) {
  const oscillator = audioCtx.createOscillator()

  oscillator.connect(audioCtx.destination)
  oscillator.type = "sine"
  oscillator.frequency.setValueAtTime(
    Math.log(mutationsList.length + 5) * 880,
    audioCtx.currentTime,
  )

  oscillator.start()
  oscillator.stop(audioCtx.currentTime + 0.01)
})

observer.observe(document, {
  attributes: true,
  childList: true,
  subtree: true,
  characterData: true,
})  

Here's a funny variation that speaks out the counts in different pitches/rates

const speechSynthesis = window.speechSynthesis
const min = 0
const max = 100
const bad = 15 // just a random max to enable 'bad developer' mode

const observer = new MutationObserver(function(mutationsList) {
  const msg = new SpeechSynthesisUtterance()
  const len = mutationsList.length
  
  if (len > bad) {
    msg.text = 'Bad Developer'
  } else {
    const n = len > max ? max : len
    const pitch = ((n - min) / (100 - min)) * 2
    msg.text = len
    msg.rate = 4 - pitch * 4
    msg.pitch = 2 - (pitch * 1.6 * 1.2)
  }

  speechSynthesis.speak(msg)
})

observer.observe(document, {
  attributes: true,
  childList: true,
  subtree: true,
  characterData: true,
})

SweepSwoop.js

const audioCtx = new window.AudioContext();
const oscillator = audioCtx.createOscillator();
oscillator.connect(audioCtx.destination);
oscillator.type = "sine";

let numItems = 0

oscillator.frequency.setValueAtTime(
  1,
  audioCtx.currentTime
);

oscillator.start();

const observer = new MutationObserver(function (mutationsList) {
  numItems += mutationsList.length

  oscillator.frequency.setValueAtTime(
    Math.log(numItems + 1) * 440,
    audioCtx.currentTime
  );

  setTimeout(() => {
    numItems -= mutationsList.length
    if (numItems === 0) {
      oscillator.frequency.setValueAtTime(
          1,
          audioCtx.currentTime
        )
    } else {
        oscillator.frequency.setValueAtTime(
          Math.log(numItems + 1) * 440,
          audioCtx.currentTime
        )
    }
  }, 100)
});

observer.observe(document, {
  attributes: true,
  childList: true,
  subtree: true,
  characterData: true
});