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HTML

              
                <p>Now Listen. I vary the sentence length, and I create music. Music. The writing sings. It has pleasamt rhythm, a lilt, a harmony. I use short sentences. And I use sentences of medium length. And sometimes when I am certain the reader is rested, I will engage him with a sentence of considerable length, a sentence that burns with energy and builds with all the impetus of a crescendo, the roll of the drums, the crash of the cymbals - sounds that say listen to this, it is important.</p>

<p>Lorem ipsum. Consectetur adipiscing elit. Nam diam lectus, vulputate sit amet felis eu, bibendum imperdiet felis. Donec urna sapien. Mattis non imperdiet efficitur, hendrerit sit amet neque. Donec. Donec malesuada urna quis est molestie, et vestibulum neque luctus malesuada urna quis malesuada urna quis quisque sit amet dui at arcu tempor varius. Nulla eu posuere lectus. Suspendisse potenti. Suspendisse. Nec erat vitae ligula sodales porttitor ut pellentesque ligula. Duis dapibus maximus massa, ac ultricies tortor pharetra sed. Mauris id enim ac ante ornare dictum sed vitae ipsum. Proin lobortis nec enim sit amet faucibus vivamus ligula est, ultricies vel massa sed, ultrices tincidunt justo nam posuere viverra eros in faucibus.</p>
              
            
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CSS

              
                body{
  max-width: 400px;
  margin: 2% auto;
  line-height:1.5;
}
              
            
!

JS

              
                // Highlight Text Based on Length
// Split Text By Sentence "."
// Append <span> to each sentence with colour based off text length
// Replace text inside each P with wrapped spans.
(function(){
  
  var paragraphs = document.getElementsByTagName('p');
  
  // Sentence Length Colours
  var c = {
    s: '#fcf9cf',
    m: '#f3cff1',
    l: '#c4f0c5',
    xl: '#9befee'
  };
  
  // Sentence Lengths
  var len = {
    s: 15,
    m: 35,
    l: 120
  };

  [].forEach.call(paragraphs, function(p){
    var sentences = p.innerHTML.split('.');
    var html = [];

    [].forEach.call(sentences, function(sentence){

      // Short Text
      if (sentence.length < len.s){
        html.push('<span style="background:' + c.s + '">' + sentence + '</span>');
      }

      // Medium Text
      if (sentence.length >= len.s && sentence.length < len.m ){
        html.push('<span style="background:' + c.m + '">' + sentence + '</span>');
      }

      // Large Text
      if (sentence.length >= len.m && sentence.length < len.l ){
        html.push('<span style="background:' + c.l + '">' + sentence + '</span>');
      }

      // X-Large Text
      if (sentence.length > len.l ){
        html.push('<span style="background:' + c.xl + '">' + sentence + '</span>');
      }

    });

    p.innerHTML = html.join('.');
  });
  
})();
              
            
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