First commit, proof of concept

.gitignore

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+# Include your project-specific ignores in this file
+# Read about how to use .gitignore: https://help.github.com/articles/ignoring-files
+# Useful .gitignore templates: https://github.com/github/gitignore
+node_modules
+dist
+.cache

README.md

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+Mix Youtube videos like a pro DJ!

css/main.css

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+/*! HTML5 Boilerplate v8.0.0 | MIT License | https://html5boilerplate.com/ */
+
+/* main.css 2.1.0 | MIT License | https://github.com/h5bp/main.css#readme */
+/*
+ * What follows is the result of much research on cross-browser styling.
+ * Credit left inline and big thanks to Nicolas Gallagher, Jonathan Neal,
+ * Kroc Camen, and the H5BP dev community and team.
+ */
+
+/* ==========================================================================
+   Base styles: opinionated defaults
+   ========================================================================== */
+
+html {
+  color: #222;
+  font-size: 1em;
+  line-height: 1.4;
+}
+
+/*
+ * Remove text-shadow in selection highlight:
+ * https://twitter.com/miketaylr/status/12228805301
+ *
+ * Vendor-prefixed and regular ::selection selectors cannot be combined:
+ * https://stackoverflow.com/a/16982510/7133471
+ *
+ * Customize the background color to match your design.
+ */
+
+::-moz-selection {
+  background: #b3d4fc;
+  text-shadow: none;
+}
+
+::selection {
+  background: #b3d4fc;
+  text-shadow: none;
+}
+
+/*
+ * A better looking default horizontal rule
+ */
+
+hr {
+  display: block;
+  height: 1px;
+  border: 0;
+  border-top: 1px solid #ccc;
+  margin: 1em 0;
+  padding: 0;
+}
+
+/*
+ * Remove the gap between audio, canvas, iframes,
+ * images, videos and the bottom of their containers:
+ * https://github.com/h5bp/html5-boilerplate/issues/440
+ */
+
+audio,
+canvas,
+iframe,
+img,
+svg,
+video {
+  vertical-align: middle;
+}
+
+/*
+ * Remove default fieldset styles.
+ */
+
+fieldset {
+  border: 0;
+  margin: 0;
+  padding: 0;
+}
+
+/*
+ * Allow only vertical resizing of textareas.
+ */
+
+textarea {
+  resize: vertical;
+}
+
+/* ==========================================================================
+   Author's custom styles
+   ========================================================================== */
+#desk {
+  display: flex;
+}
+
+.volumeSlider {
+  transform: rotate(270deg);
+}
+/* ==========================================================================
+   Helper classes
+   ========================================================================== */
+
+/*
+ * Hide visually and from screen readers
+ */
+
+.hidden,
+[hidden] {
+  display: none !important;
+}
+
+/*
+ * Hide only visually, but have it available for screen readers:
+ * https://snook.ca/archives/html_and_css/hiding-content-for-accessibility
+ *
+ * 1. For long content, line feeds are not interpreted as spaces and small width
+ *    causes content to wrap 1 word per line:
+ *    https://medium.com/@jessebeach/beware-smushed-off-screen-accessible-text-5952a4c2cbfe
+ */
+
+.sr-only {
+  border: 0;
+  clip: rect(0, 0, 0, 0);
+  height: 1px;
+  margin: -1px;
+  overflow: hidden;
+  padding: 0;
+  position: absolute;
+  white-space: nowrap;
+  width: 1px;
+  /* 1 */
+}
+
+/*
+ * Extends the .sr-only class to allow the element
+ * to be focusable when navigated to via the keyboard:
+ * https://www.drupal.org/node/897638
+ */
+
+.sr-only.focusable:active,
+.sr-only.focusable:focus {
+  clip: auto;
+  height: auto;
+  margin: 0;
+  overflow: visible;
+  position: static;
+  white-space: inherit;
+  width: auto;
+}
+
+/*
+ * Hide visually and from screen readers, but maintain layout
+ */
+
+.invisible {
+  visibility: hidden;
+}
+
+/*
+ * Clearfix: contain floats
+ *
+ * For modern browsers
+ * 1. The space content is one way to avoid an Opera bug when the
+ *    `contenteditable` attribute is included anywhere else in the document.
+ *    Otherwise it causes space to appear at the top and bottom of elements
+ *    that receive the `clearfix` class.
+ * 2. The use of `table` rather than `block` is only necessary if using
+ *    `:before` to contain the top-margins of child elements.
+ */
+
+.clearfix::before,
+.clearfix::after {
+  content: " ";
+  display: table;
+}
+
+.clearfix::after {
+  clear: both;
+}
+
+/* ==========================================================================
+   EXAMPLE Media Queries for Responsive Design.
+   These examples override the primary ('mobile first') styles.
+   Modify as content requires.
+   ========================================================================== */
+
+@media only screen and (min-width: 35em) {
+  /* Style adjustments for viewports that meet the condition */
+}
+
+@media print,
+  (-webkit-min-device-pixel-ratio: 1.25),
+  (min-resolution: 1.25dppx),
+  (min-resolution: 120dpi) {
+  /* Style adjustments for high resolution devices */
+}
+
+/* ==========================================================================
+   Print styles.
+   Inlined to avoid the additional HTTP request:
+   https://www.phpied.com/delay-loading-your-print-css/
+   ========================================================================== */
+
+@media print {
+  *,
+  *::before,
+  *::after {
+    background: #fff !important;
+    color: #000 !important;
+    /* Black prints faster */
+    box-shadow: none !important;
+    text-shadow: none !important;
+  }
+
+  a,
+  a:visited {
+    text-decoration: underline;
+  }
+
+  a[href]::after {
+    content: " (" attr(href) ")";
+  }
+
+  abbr[title]::after {
+    content: " (" attr(title) ")";
+  }
+
+  /*
+   * Don't show links that are fragment identifiers,
+   * or use the `javascript:` pseudo protocol
+   */
+  a[href^="#"]::after,
+  a[href^="javascript:"]::after {
+    content: "";
+  }
+
+  pre {
+    white-space: pre-wrap !important;
+  }
+
+  pre,
+  blockquote {
+    border: 1px solid #999;
+    page-break-inside: avoid;
+  }
+
+  /*
+   * Printing Tables:
+   * https://web.archive.org/web/20180815150934/http://css-discuss.incutio.com/wiki/Printing_Tables
+   */
+  thead {
+    display: table-header-group;
+  }
+
+  tr,
+  img {
+    page-break-inside: avoid;
+  }
+
+  p,
+  h2,
+  h3 {
+    orphans: 3;
+    widows: 3;
+  }
+
+  h2,
+  h3 {
+    page-break-after: avoid;
+  }
+}

css/normalize.css

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+/*! normalize.css v8.0.1 | MIT License | github.com/necolas/normalize.css */
+
+/* Document
+   ========================================================================== */
+
+/**
+ * 1. Correct the line height in all browsers.
+ * 2. Prevent adjustments of font size after orientation changes in iOS.
+ */
+
+html {
+  line-height: 1.15; /* 1 */
+  -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/* Sections
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers.
+ */
+
+body {
+  margin: 0;
+}
+
+/**
+ * Render the `main` element consistently in IE.
+ */
+
+main {
+  display: block;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+pre {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * Remove the gray background on active links in IE 10.
+ */
+
+a {
+  background-color: transparent;
+}
+
+/**
+ * 1. Remove the bottom border in Chrome 57-
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+  border-bottom: none; /* 1 */
+  text-decoration: underline; /* 2 */
+  text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+samp {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove the border on images inside links in IE 10.
+ */
+
+img {
+  border-style: none;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change the font styles in all browsers.
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  font-family: inherit; /* 1 */
+  font-size: 100%; /* 1 */
+  line-height: 1.15; /* 1 */
+  margin: 0; /* 2 */
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+  overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+  text-transform: none;
+}
+
+/**
+ * Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button;
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+/**
+ * Correct the padding in Firefox.
+ */
+
+fieldset {
+  padding: 0.35em 0.75em 0.625em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+  box-sizing: border-box; /* 1 */
+  color: inherit; /* 2 */
+  display: table; /* 1 */
+  max-width: 100%; /* 1 */
+  padding: 0; /* 3 */
+  white-space: normal; /* 1 */
+}
+
+/**
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+  vertical-align: baseline;
+}
+
+/**
+ * Remove the default vertical scrollbar in IE 10+.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10.
+ * 2. Remove the padding in IE 10.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding in Chrome and Safari on macOS.
+ */
+
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button; /* 1 */
+  font: inherit; /* 2 */
+}
+
+/* Interactive
+   ========================================================================== */
+
+/*
+ * Add the correct display in Edge, IE 10+, and Firefox.
+ */
+
+details {
+  display: block;
+}
+
+/*
+ * Add the correct display in all browsers.
+ */
+
+summary {
+  display: list-item;
+}
+
+/* Misc
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 10+.
+ */
+
+template {
+  display: none;
+}
+
+/**
+ * Add the correct display in IE 10.
+ */
+
+[hidden] {
+  display: none;
+}

index.html

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+<!doctype html>
+<html class="no-js" lang="">
+
+<head>
+  <meta charset="utf-8">
+  <title></title>
+  <meta name="description" content="">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+
+  <meta property="og:title" content="">
+  <meta property="og:type" content="">
+  <meta property="og:url" content="">
+  <meta property="og:image" content="">
+
+  <link rel="manifest" href="site.webmanifest">
+  <!-- <link rel="apple-touch-icon" href="icon.png"> -->
+  <!-- Place favicon.ico in the root directory -->
+
+  <link rel="stylesheet" href="css/normalize.css">
+  <link rel="stylesheet" href="css/main.css">
+
+  <meta name="theme-color" content="#fafafa">
+</head>
+
+<body>
+
+  <!-- Add your site or application content here -->
+  <p>YTDJ!</p>
+  <div id="desk">
+    <div class="player">
+      <iframe id="playerA" src="" width="480" height="270", frameborder='0'></iframe>
+      <input type="range" class="volumeSlider" min='0' max = '100' value="80">
+    </div>
+    <div class="player">
+      <iframe id="playerB" src="" width="480" height="270", frameborder='0'></iframe>
+      <input type="range" class="volumeSlider" min='0' max = '100' value="80">
+    </div>
+  </div>
+  <input type="range" id='crossfader' name="crossfader" min='0' max='1000' value='500'>
+
+  <script src="js/vendor/modernizr-3.11.2.min.js"></script>
+  <script src="js/plugins.js"></script>
+  <script src="js/main.js"></script>
+
+</body>
+
+</html>

js/main.js

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+// let id = window.location.search ? window.location.search.substring(1) : album;
+// let playerA = {
+//   iframe: document.querySelector('#playerA'),
+//   player: undefined,
+//   id: 'anWaxGNDRJ4',
+//   vol: 100
+// }
+// let playerB = {
+//   iframe: document.querySelector('#playerB'),
+//   player: undefined,
+//   id: 'PhEuAuhH418',
+//   vol: 100
+// }
+
+// Loads the IFrame Player API code asynchronously.
+let tag = document.createElement('script');
+tag.src = 'https://www.youtube.com/iframe_api';
+let firstScriptTag = document.getElementsByTagName('script')[0];
+firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
+
+
+class player {
+  trackId;
+  // volume;
+  // id;
+  // iframe;
+  player;
+  // node;
+  constructor(id) {
+    this.id = id;
+    this.iframe = document.querySelector('#'+this.id);
+    // console.log('#'+this.id);
+    // console.log(this.iframe);
+    // this.volume = vol;
+
+    this.node = this.iframe.parentNode;
+    this.volume = this.node.querySelector('.volumeSlider').value;
+
+  }
+
+  init(trackid) {
+    let src = `https://www.youtube.com/embed/${trackid}?enablejsapi=1&playsinline=1&autoplay=0&rel=0&modestbranding=1&version=3`;
+    this.iframe.setAttribute('src', src);
+    this.player = new YT.Player(this.id, {
+      events: {
+        'onReady': this.onPlayerReady.bind(this),
+        'onStateChange': onPlayerStateChange
+      }
+    });
+
+    this.node.querySelector('.volumeSlider').addEventListener('input', (e) => {
+      let volume = e.target.value;
+      this.volume = volume;
+      this.player.setVolume(volume);
+    });
+  }
+  onPlayerReady(e) {
+    // console.log(e.target);
+    // this.node.querySelector('.volumeSlider').value = this.player.getVolume();
+    // e.target.playVideo();
+    console.log(e.target);
+    // e.target.setVolume(this.volume);
+    this.player.setVolume(this.volume);
+  }
+}
+
+
+let playerA = new player('playerA');
+let playerB = new player('playerB');
+
+
+function onYouTubeIframeAPIReady() {
+  playerA.init('anWaxGNDRJ4')
+  playerB.init('PhEuAuhH418');
+}
+
+function onPlayerStateChange(event) {
+  console.log('state change: ' + event.data);
+}
+
+let crossfader = document.querySelector('#crossfader');
+
+crossfader.addEventListener('input', (e) => {
+
+  let normVal = crossfader.value / 1000;
+  // let coefB = normVal ** 2;
+  // let coefA = (1 - normVal) ** 2;
+
+  let coefB = min(normVal*2, 1);
+  let coefA = min((1-normVal)*2, 1);
+
+  // console.log('crossfader: ' + crossfader.value);
+  // console.log('coefA: ' + coefA);
+  // console.log('coefB: ' + coefB);
+
+  playerA.player.setVolume(playerA.volume * coefA);
+  playerB.player.setVolume(playerB.volume * coefB);
+
+})
+
+function min(x, y) {
+  if (x > y) {
+    return y;
+  } else {
+    return x;
+  }
+}

js/plugins.js

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+// Avoid `console` errors in browsers that lack a console.
+(function() {
+  var method;
+  var noop = function () {};
+  var methods = [
+    'assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error',
+    'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log',
+    'markTimeline', 'profile', 'profileEnd', 'table', 'time', 'timeEnd',
+    'timeline', 'timelineEnd', 'timeStamp', 'trace', 'warn'
+  ];
+  var length = methods.length;
+  var console = (window.console = window.console || {});
+
+  while (length--) {
+    method = methods[length];
+
+    // Only stub undefined methods.
+    if (!console[method]) {
+      console[method] = noop;
+    }
+  }
+}());
+
+// Place any jQuery/helper plugins in here.

robots.txt

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+# www.robotstxt.org/
+
+# Allow crawling of all content
+User-agent: *
+Disallow: