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HTML

CSS

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HTML

              
                

<h1>Fixed Container</h1>
<section id="fixed_container">
  
  <div>
    APPLES
  </div>

  <div>
    APPLES & ORANGES
  </div>

  <div>
    APPLES & ORANGES & BANANAS
  </div>
</section>

<h1>Fluid Container</h1>
<section id="fluid_container">
  <div>
    APPLES
  </div>

  <div>
    APPLES & ORANGES
  </div>

  <div>
    APPLES & ORANGES & BANANAS
  </div>
</section>



              
            
!

CSS

              
                section {
  margin: 3em;
  padding: 1em;
  background-color: #DDDDDD;
  width: 150px;
}

section div {
    background-color: #CCCCCC;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
              
            
!

JS

              
                checkFontSize();


function checkFontSize() {
  var elems = document.querySelectorAll("div");
  
  [].forEach.call(elems, function(el) {
    scaleFontSize(el);
  });  

}

function scaleFontSize(element) {
 
    // We only want to scale down long text, so first we reset
    // font-size to 100%
    element.style.fontSize = "100%";
  
    // Now we chceck if the content is wider than parent
    // If so, then reduce letter spacing a tiny bit, maybe it's enough
    if (element.scrollWidth > element.clientWidth) {
        element.style.letterSpacing = "-0.05em";
    }
  
    // We check the content width oncemore and if it still doesn't fit
    // then we reduce font size by 80%, but also reset letter spacing to 0 for legibility.
    if (element.scrollWidth > element.clientWidth) {
        element.style.letterSpacing = "0";
        element.style.fontSize = "80%";
    }
  
    // Text which is still longer will get truncated by the CSS rule ellipsis
  
}
              
            
!
999px

Console