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HTML

              
                <h1>Durham Ipsum</h1>
<p>The eleanor morehead hills american tobacco upcycled five points cupcakes brewery beer blues tobacco, sodu carolina theatre bicycle basketball coworking locavore north east luewwd, art of cool coffee vest hope valley liberty beard mount moriah bragtown. Mountain goats science and math coffee craft cocktail city of medicine rolling hills listserv, diamondview nasher tw alexander fixie skate park 15-501 triangle localista, local basketball bullcity old five points eagles.</p>

<p>Erwin square blues festival listserv alston avenue people's pharmacy edgemont one forty seven, innovation big green wall blues foodie alston avenue. Fixie doughman eagles chapel hill street durham d-town watts-hillandale southpoint, bull wunc southside chapel drive merge records cupcakes.</p>

              
            
!

CSS

              
                body {
  font-family: sans-serif;
}

body.fonts-loaded {
  font-family: 'Open Sans', sans-serif;
}

.fonts-loaded h1 {
  font-family: 'Open Sans Condensed';
}
              
            
!

JS

              
                var fontFamilies = {
  'Open Sans': [
    {
      weight: 400
    },
    {
      weight: 700
    }
  ],
  'Open Sans Condensed': [
    {
      weight: 700
    }
  ]
}

var fontObservers = []; Object.keys(fontFamilies).forEach(function(family) {
  fontObservers.push(fontFamilies[family].map(function(config) {
    return new FontFaceObserver(family, config).check()
  }));
});

Promise.all(fontObservers)
  .then(function() {
    document.body.classList.add('fonts-loaded');
  }, function() {
    console.log('Fonts not available');
  });
              
            
!
999px

Console