`col-xs-*` not working in Bootstrap 4

I have not encountered this before, and I am having a very hard time trying to find the solution. When having a column equal to medium in bootstrap like so:

<h1 class="text-center">Hello, world!</h1>

  <div class="container">
      <div class="row">
          <div class="col-md-12 text-center">
              <h1>vicki williams</h1>
          </div>
      </div>
  </div>

The text-align works fine: enter image description here

But when making the column equal to extra small like so:

 <div class="container">
      <div class="row">
          <div class="col-xs-12 text-center">
              <h1>vicki williams</h1>
          </div>
      </div>
  </div>

Then the text-align no longer works: enter image description here

Is there some bootstrap concept that I am not understanding or is this in fact a error like I think it is. I have never had this issue, as my text always has aligned in the past with xs. Any help would be greatly appreciated. Here is my complete code:

<!DOCTYPE html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <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">
  </head>
  <body>
    <h1 class="text-center">Hello, world!</h1>

      <div class="container">
          <div class="row">
              <div class="col-xs-12 text-center">
                  <h1>vicki williams</h1>
              </div>
          </div>
      </div>

    <!-- jQuery first, then Tether, then Bootstrap JS. -->
    <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>
  </body>
</html>

col-xs-* have been dropped in Bootstrap 4 in favor of col-*.

Replace col-xs-12 with col-12 and it will work as expected.

Also note col-xs-offset-{n} were replaced by offset-{n} in v4.

I just wondered, why col-xs-6 did not work for me but then I found the answer in the Bootstrap 4 documentation. The class prefix for extra small devices is now col- while in the previous versions it was col-xs.

https://getbootstrap.com/docs/4.1/layout/grid/#grid-options

Bootstrap 4 dropped all col-xs-* classes, so use col-* instead. For example col-xs-6 replaced by col-6.

`col-xs-*` not working in Bootstrap 4

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