Video playback rate bookmarklet

bookmarklet

javascript:(()=>{const%20rateString=%s||window.prompt("Set%20video%20playback%20rate","1.0");const%20rate=parseFloat(rateString);if(isNaN(rate)){window.alert(`Selected%20playback%20rate%20"${rate}"%20cannot%20be%20parsed.`);return}[...document.querySelectorAll('video')].forEach(videoElement=>videoElement.playbackRate=rate)})()

source.js

/*
 * Compatible with "keyword feature (https://superuser.com/questions/540076/how-to-add-keyword-to-bookmark-in-chrome,
 * https://www-archive.mozilla.org/docs/end-user/keywords.html). Porvided the keyword is "rate", just type to address
 * bar:
 *
 *     rate 1.3
 */
(() => {
  const rateString = %s || window.prompt("Set video playback rate", "1.0");
  const rate = parseFloat(rateString);
  if (isNaN(rate)) {
    window.alert(`Selected playback rate "${rate}" cannot be parsed.`);
    return
  }
  [...document.querySelectorAll('video')]
    .forEach(videoElement => videoElement.playbackRate = rate)
})()