I have this code:
<html>
<head>
<link rel="stylesheet" href="bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-12 col-md-6">A</div>
<div class="col-12 col-md-6">B</div>
</div>
</div>
</body>
</html>
Bootstrap version is 4 alpha. Those two columns are next to each other and are 50% width on all (320, 480, 720, 1024, 1440 etc.) resolutions. I seem to recall Bootstrap switching to 100% width once you reach the mobile resolutions but it's not doing it anymore.
Did I do something wrong or did Bootstrap stop being responsive?