Dynamically change the size of the font size based on text length

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Say you have this:

<div id="outer" style="width:200px; height:20px; border:1px solid red;">
    <div>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer mollis dui felis, vel vehicula tortor cursus nec</div>
</div>

Then you can do something like:

$(document).ready(function () {
    resize_to_fit();
});

function resize_to_fit(){
    var fontsize = $('div#outer div').css('font-size');
    $('div#outer div').css('fontSize', parseFloat(fontsize) - 1);

    if($('div#outer div').height() >= $('div#outer').height()){
        resize_to_fit();
    }
}

Working Sample

$(document).ready(function() {
  resize_to_fit();
});

function resize_to_fit() {
  var fontsize = $('div#outer div').css('font-size');
  $('div#outer div').css('fontSize', parseFloat(fontsize) - 1);

  if ($('div#outer div').height() >= $('div#outer').height()) {
    resize_to_fit();
  }
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="outer" style="width:200px; height:20px; border:1px solid red;">
  <div>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer mollis dui felis, vel vehicula tortor cursus nec</div>
</div>

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