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              <section><div class="content">
  <h1>
    <span>Variable</span>
    <span>Fonts</span>
  </h1>
  <p>A talk by <a href="https://scottkellum.com">Scott Kellum</a></p>
</div></section><section><div class="content">
  <img src="http://www.alphabettes.org/wp-content/uploads/2017/06/size_ranges_2.png" alt="">
  <p class="caption">Benton Modern’s optical sizes</p>
</div></section><section><div class="content">
  <ul>
    <li>Optical sizes</li>
    <li>Weight</li>
    <li>Width</li>
    <li>Grade</li>
  </ul>
</div></section><section><div class="content">
  <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/noordzij%20cube%20white.svg" alt=" ">
  <p class="caption">A <a href="http://letterror.com/2014/09/19/mutatormath/">Noordzij cube</a> of the Freight family</p>
</div></section><section><div class="content">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/superpolator.png" alt="">
  <p class="caption"><a href="http://superpolator.com/">Superpolator</a></p>
</div></section><section><div class="content skia">
  <h1>Skia</h1>
</div></section><section><div class="content">
  <pre><code>body {
  font-weight: 400;
}</code></pre>
</div></section><section><div class="content decovar">
  <h1 id="decovarHead" contenteditable>Decovar</h1>
  <form id="decovarForm">
    <label>
      <span>Inline</span>
      <input name="BLDA" type="range" min="0" max="1000" value="0">
    </label>
    <label>
      <span>Skeleton</span>
      <input name="SKLA" type="range" min="0" max="1000" value="0">
    </label>
    <label>
      <span>Weight</span>
      <input name="WMX2" type="range" min="0" max="1000" value="0">
    </label>
    <label>
      <span>Rounded</span>
      <input name="TRMA" type="range" min="0" max="1000" value="0">
    </label>
    <label>
      <span>Slab</span>
      <input name="TRMC" type="range" min="0" max="1000" value="0">
    </label>
  </form>
</div></section><section><div class="content zicon">
  <h1>🌝🐈🐕🐢💡🔒🕛🖐🚴🦉🦎</h1>
</div></section><section><div class="content">
  <h1><span>cool, but why use them?</span></h1>
</div></section><section><div class="content">
  <h2>Implementation</h2>
  <pre><code>@font-face {
  font-family: 'Tablet Gothic';
  src: url('/TabletGothicGX.woff2') format('woff2');
}</code></pre>
  <pre><code>body {
  font-family: 'Tablet Gothic';
  font-weight: 600;
  font-variation-settings: 'wght' 600, 'wdth' 2;
}</code></pre>
</div></section><section><div class="content">
  <video autoplay loop src="https://dropbox.design/videos/DB_Type_170922_v01.mp4"></video>
  <p class="caption">Sharp Grotesk for Dropbox (259 fonts)</p>
</div></section><section><div class="content sbnation">
  <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/sbnation.png" alt="">
</div></section><section><div class="content">
  <video autoplay loop src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/andrew-johnson.webm" type="video/webm"></video>
  <p class="caption"><a href="https://www.instagram.com/p/BeGDXM0Aehc/">Andrew Johnson on Instagram</a></p>
</div></section><section><div class="content">
  <video autoplay loop src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/typetura.webmsd.webm" type="video/webm"></video>
  <p class="caption"><a href="https://github.com/scottkellum/typetura.js">Typetura.js</a></p>
</div></section><section><div class="content">
  <pre><code>h1 {
  --variation-wght:
    2 ~ 500,
    .2 ~ 1000
  ;
  --variation-wdth:
    1.2 ~ 500,
    .8 ~ 1000
  ;
}</code></pre>
</div></section><section><div class="content">
  <ul>
    <li>Identify custom properties</li>
    <li>Create object to store settings</li>
    <li>Add CSS variables to the context</li>
    <li>Link regular CSS properties to the variables</li>
    <li>On resize, only the variables change</li>
  </ul>
</div></section><section><div class="content">
  <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/Screen%20Shot%202018-03-28%20at%2012.40.43%20PM.png" alt="">
</div></section><section><div class="content">
  <h2>CSS Houdini</h2>
  <pre><code>registerPaint('typetura', class {
  static get inputProperties() {
    return [
      '--font-variation-settings'
    ];
  }
}</code></pre>
</div></section><section><div class="content interface">
  <form style="font-size: 2em" id="interface">
    <label>
      <span>Departure</span>
      <input type="time" id="formDept" value="08:00"style="width: 8em">
      <span class="zicon clock" id="formDeptIcn">🕛</span>
    </label>
    <label>
      <span>Arrival</span>
      <input type="time" id="formArr" value="12:00"style="width: 8em">
      <span class="zicon clock" id="formArrIcn">🕛</span>
    </label>
  </form>
</div></section><section><div class="content">
  <img src="https://cdn.shopify.com/s/files/1/0155/2821/products/Madita_Anim_3366bd73-0e31-42b4-bbc5-8a953ebbb023.gif?v=1501249504" alt="">
  <p class="caption"><a href="https://animography.net/products/madita">Madita</a> Animography by Philip von Borries</p>
</div></section><section><div class="content">
<iframe scrolling='no' title='Animography’s Mobilo Text Editor in SVG' src='//codepen.io/airnan/embed/preview/JbOrbV/?height=265&theme-id=light&default-tab=result&embed-version=2'>See the Pen <a href='https://codepen.io/airnan/pen/JbOrbV/'>Animography's Mobilo Text Editor in SVG</a> by kittons (<a href='https://codepen.io/airnan'>@airnan</a>) on <a href='https://codepen.io'>CodePen</a>.
</iframe>
</div></section><section><div class="content">
  <h1><span>Variable fonts are</span> <span>new</span></h1>
</div></section><section><div class="content">
  <h2>Variable font resources</h2>
  <ul>
    <li><a href="https://www.axis-praxis.org/">Axis-Praxis</a></li>
    <li><a href="https://medium.com/@tiro/https-medium-com-tiro-introducing-opentype-variable-fonts-12ba6cd2369">Variable font introduction</a></li>
    <li><a href="https://github.com/scottkellum/typetura.js">Typetura.js</a></li>
    <li><a href="https://developer.microsoft.com/en-us/microsoft-edge/testdrive/demos/variable-fonts/">Microsoft’s variable font demo</a></li>
  </ul>
</div></section>
            
          
!
            
              /// SLIDES
.content.decovar {
  h1 {
    font-family: decovar;
    width: 100%;
    animation: none;
  }
}

.content.zicon {
  h1 {
    font-family: zicon;
    text-shadow: none;
    font-weight: 400;
    width: 90vw;
    font-size: 23vw;
    animation: zicon 1s infinite alternate ease-in-out;
    text-align: center;
  }
}

@keyframes zicon {
  from {
    font-variation-settings: 'T1  ' 0, 'T2  ' 0, 'T3  ' 0, 'T4  ' 0, 'M1  ' -1, 'M2  ' -1;
  }
  to {
    font-variation-settings: 'T1  ' 1, 'T2  ' 1, 'T3  ' 1, 'T4  ' 1, 'M1  ' 1, 'M2  ' 1;
  }
}

.content.skia {
  h1 {
    font-family: skia;
    animation: skia 5s infinite alternate ease;
    text-align: center;
  }
}

@keyframes skia {
  from {
    font-variation-settings: 'wght' 0.48, 'wdth' 0.61998;
  }
  to {
    font-variation-settings: 'wght' 3.2, 'wdth' 1.3;
  }
}

.content.sbnation {
  img {
    width: 100vw;
    height: 100vh;
    object-fit: cover;
  }
}

.content.interface {
  span.zicon {
    font-family: zicon;
    font-weight: normal;
    width: 1em;
    font-size: 1.4em;
    position: relative;
    transform: translatey(.18em);
  }
  span.clock {
    transform: translatey(.18em) rotate(180deg);
  }
  span.mi {
    width: 4.5em;
    font-variation-settings: 'wght' 300;
  }
  span.pace {
    font-size: 20vw;
    margin: -.4em auto 0;
    display: block;
  }
}

/// STYLES

@font-face {
  font-family: 'Tablet Gothic';
  src: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/467/TabletGothicGX.ttf')  format('TrueType');
}

@font-face {
  font-family: zicon;
  src: url('https://www.axis-praxis.org/fonts/webfonts/Zycon.ttf')  format('TrueType');
}

@font-face {
  font-family: decovar;
  src: url('https://www.axis-praxis.org/fonts/webfonts/DecovarAlpha-VF.ttf')  format('TrueType');
}

body {
  overflow: hidden;
  background-image: linear-gradient(-45deg, #f44242, transparent), linear-gradient(45deg, rgba(#ef9f09,.4), transparent);
  background-color: #8e00e0;
  transition: background-color .5s ease;
  width: 100vw;
  height: 100vh;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: #fff;
  animation: body 400s infinite linear;
}

@keyframes body {
  0% {
    background-color: #8e00e0;
  }
  20% {
    background-color: #23aeff;
  }
  40% {
    background-color: #0ed148;
  }
  60% {
    background-color: #ffb600;
  }
  80% {
    background-color: #ed5223;
  }
  100% {
    background-color: #8e00e0;
  }
}

section {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  display: none;
  &.active {
    display: block;
  }
}

a {
  color: inherit;
  opacity: .8;
  &:hover {
    opacity: 1;
  }
}

li {
  list-style: none;
  font-size: 4vw;
  margin: .5em;
}

pre {
  font-family: Monaco;
  font-size: 2.5vw;
}

.caption {
  display: block;
  text-align: center;
  font-style: italic;
}

.content {
  display: table;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
  max-width: 100vw;
  max-height: 100vw;
}

label {
  display: block;
  margin: 0 0 .5em 0;
  transition: font-variation-settings .3s cubic-bezier(.5, 0, .5, 1.5);
  font-variation-settings: 'wght' 200;
  &:hover {
    font-variation-settings: 'wght' 700;
  }
  span {
    display: inline-block;
    width: 6em;
  }
}

input:not([type=range]) {
  border: none;
  border-radius: 3px;
  background-color: rgba(#000,.3);
  color: inherit;
  padding: .3em .5em;
  font-family: inherit;
  font-variation-settings: 'wght' 300;
  font-size: inherit;
  outline: none;
  &:hover {
    box-shadow: 0 0 0 1px rgba(#fff,.9);
  }
}

input[type=range] {
  width: 50vw;
}

img,
video {
  width: 80vw;
  height: 80vh;
  object-fit: contain;
  display: block;
}
iframe {
  width: 90vw !important;
  height: 90vh !important;
  padding: 0 !important;
  border: none;
}

h1,
h2 {
  font-family: 'Tablet Gothic';
  line-height: 1;
  width: 80vw;
  font-size: 16vw;
  text-shadow: .02em .02em 0 rgba(#fff, .3);
  animation: variation 32s infinite linear;
  margin: .2em 0;
  span {
    display: block;
  }
  span:nth-child(2) {
    animation: variation 32s infinite linear;
    animation-delay: -7s;
  }
}

h2 {
  font-size: 6vw;
}

@keyframes variation {
  0% {
    font-variation-settings: 'wght' 300, 'wdth' 7;
  }
  20% {
    font-variation-settings: 'wght' 500, 'wdth' 1;
  }
  40% {
    font-variation-settings: 'wght' 400, 'wdth' 3;
  }
  60% {
    font-variation-settings: 'wght' 900, 'wdth' 5;
  }
  80% {
    font-variation-settings: 'wght' 700, 'wdth' 2;
  }
  100% {
    font-variation-settings: 'wght' 300, 'wdth' 7;
  }
}
            
          
!
            
              // Slide behavior

var section = document.querySelectorAll('section');
section[0].classList.add('active');

// Slides

// Decovar
var decovarHead = document.getElementById('decovarHead');
var decovarForm = document.getElementById('decovarForm');
var decovarSettings = {};

decovarForm.oninput=decovarChange;

function decovarChange(event) {
  var name = event.srcElement.name;
  var value = event.srcElement.value;
  decovarSettings[name] = value;
  
  var string = '';
  for (var p in decovarSettings) {
    string = string + '\'' + p + '\'' + ' ' + decovarSettings[p] + ', ';
  }
  string = string.slice(0, -2);
  decovarHead.style.fontVariationSettings = string;
}

// interface

var interface = document.getElementById('interface');

var deptIcn = document.getElementById('formDeptIcn');
var arrIcn = document.getElementById('formArrIcn');

interface.oninput=interfaceChange;

var parseTime = function(t) {
  t = t.split(':');
  t[1] = t[1] / 60;
  t = parseInt(t[0]) + t[1];
  t = t % 12;
  t = t / 12 * 2 - 1;
  return t
}

function interfaceChange(event) {
  var dept = document.getElementById('formDept').value;
  var arr = document.getElementById('formArr').value;
  dept = parseTime(dept);
  arr = parseTime(arr);
  deptIcn.style.fontVariationSettings = '\'M1  \'' + dept;
  arrIcn.style.fontVariationSettings = '\'M1  \'' + arr;
}

var dept = document.getElementById('formDept').value;
var arr = document.getElementById('formArr').value;
dept = parseTime(dept);
arr = parseTime(arr);
deptIcn.style.fontVariationSettings = '\'M1  \'' + dept;
arrIcn.style.fontVariationSettings = '\'M1  \'' + arr;

// Paging and general stuff
function prev() {
  var el = document.querySelector('.active');
  var prev = el.previousSibling;
  console.log(prev.nodeType);
  if(prev && prev.nodeType != 3) {
    prev.classList.add('active');
    el.classList.remove('active');
  }
}
function next() {
  var el = document.querySelector('.active');
  var next = el.nextSibling;
  console.log(next.nodeType);
  if(next && next.nodeType != 3) {
    next.classList.add('active');
    el.classList.remove('active');
  }
}

// SETTINGS
var wayDirection       = 'horizontal'; // vertical, horizontal
var wayKeys            = true; // boolean
var wayScroll          = true; // boolean
var waySwiping         = true; // boolean
var wayThresholdScroll = 3; // how sensitive is scrolling?
var wayThresholdSwipe  = 20; // how sensitive is swiping?

// KEYBOARD
if(wayKeys) { // Key inputs, all the usual suspects for discoverability
  document.addEventListener('keyup', (e) => {
    if(e.key === 'ArrowLeft' || e.key === 'k') {
      prev();
    }
    else if (e.key === 'ArrowRight' || e.key === 'j') {
      next();
    }
  }, false);
};

// SCROLL EVENTS
var wayScrollFired = false; // Use to debounce scroll events
if(wayScroll) { // only fire if scrolling is an option
  window.addEventListener('mousewheel', function(e) { // listen for scroll events
    // vertical scrolling
    if(wayDirection === 'vertical') {
      if(wayThresholdScroll < Math.abs(e.deltaY)) { // does it meet the threshold?
        if(!wayScrollFired) { // Fire once, debounce input
          if(e.deltaY > 0) {
            next();
          } else {
            prev();
          }
          wayScrollFired = true; // Don’t fire again until new scroll
        }
      } else { // Reset debounce when under threshold
        wayScrollFired = false;
      }
    }
    // vertical scrolling
    else {
      if(wayThresholdScroll < Math.abs(e.deltaX)) { // does it meet the threshold?
        if(!wayScrollFired) { // Fire once, debounce input
          if(e.deltaX > 0) {
            next();
          } else {
            prev();
          }
          wayScrollFired = true; // Don’t fire again until new scroll
        }
      } else { // Reset debounce when under threshold
        wayScrollFired = false;
      }
    }
  });
};

// TOUCH EVENTS
var waySwipeFired = false; // Only trigger once
document.addEventListener('touchstart', handleTouchStart, false);
document.addEventListener('touchmove', handleTouchMove, false);
document.addEventListener('touchend', handleTouchEnd, false);

var xDown;
var yDown;
var xDiff;
var yDiff;

function handleTouchStart(e) {
  xDown = e.touches[0].clientX;
  yDown = e.touches[0].clientY;
}

function handleTouchMove(e) {
  var xUp = e.touches[0].clientX;
  var yUp = e.touches[0].clientY;

  xDiff = xDown - xUp;
  yDiff = yDown - yUp;
  if(!waySwipeFired) {
    if(wayDirection === 'horizontal') {
      if(Math.abs(xDiff) > Math.abs(yDiff)) {
        if(wayThresholdSwipe < Math.abs(xDiff)) {
          if(xDiff > 0) {
            next();
          } else {
            prev();
          }
          waySwipeFired = true;
        }
      }
    } else {
      if(Math.abs(yDiff) > Math.abs(xDiff)) {
        if(wayThresholdSwipe < Math.abs(yDiff)) {
          if(yDiff > 0) {
            next();
          } else {
            prev();
          }
          waySwipeFired = true;
        }
      }
    }
  }
};

// Reset touch data
function handleTouchEnd(e) {
  xDown = null;
  yDown = null;
  xDiff = null;
  yDiff = null;
  waySwipeFired = false;
};

            
          
!
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