<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
<style>
.col,.col-12{
border:1px solid #000;
}
.mediaQuery{
font-size: 50px;
}
</style>
</head>
<body>
<div class="mediaQuery"></div>
<div class="container">
<div class="row justify-content-md-center">
<div class="col col-lg-2"> 1 of 3 </div>
<div class="col-12 col-md-auto"> Variable width content </div>
<div class="col col-lg-2"> 3 of 3 </div>
</div>
<div class="row">
<div class="col"> 1 of 3 </div>
<div class="col-12 col-md-auto"> Variable width content </div>
<div class="col col-lg-2"> 3 of 3 </div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
<script>
$(window).resize(function(){
var width = $(window).width();
if( width >= 1200){
$('.mediaQuery').text('lg');
}else if(width < 1200 && width >= 992){
$('.mediaQuery').text('md');
}else if(width < 992 && width >= 768){
$('.mediaQuery').text('sm');
}else if(width < 767){
$('.mediaQuery').text('xs');
}
});
</script>
</body>
</html>
See the Pen QQOowL by Jerry (@fenture) on CodePen.
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