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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              This text is set in [JAF Bernina Sans](https://typekit.com/fonts/jaf-bernina-sans), backed up by a Verdana stack. It uses a Sass map to scope font-size and line-height measurements to those specific typefaces, [as Robin Rendle described](http://erskinedesign.com/blog/setting-typographic-scale-with-sass-maps/). (Em units and max-widths, too.) See the variables and mixins in <a href="https://codepen.io/timbrown/pen/xrwvJ" target="_blank">this other Pen</a>.

Look at this Pen's own CSS and you'll see what I really wanted to explore. The paragraph element uses Verdana (and its associated measurements) by default, and only uses Bernina (and *its* associated measurements) if Bernina has loaded properly. The wf-active class is via [Typekit font events](https://help.typekit.com/customer/portal/articles/6787-font-events). Progressive enhancement FTW.

When the composition widens and reaches a breakpoint, its size gets bumped up — again, considering Verdana by default and Bernina *only if Bernina is present*.


Tim Brown • [@nicewebtype](https://twitter.com/nicewebtype)
              p {
  @include font-scale(base);
  .wf-active & {
    @include font-scale(base, $font-bernina);
  @include responsive(narrow-screens) {
    @include font-scale(text);
    .wf-active & {
      @include font-scale(text, $font-bernina);

body {
  margin: 2em;
  font-family: fontset-family($font-verdana);
  color: #444;
  @include responsive(narrow-screens) {
    margin: 2em 4em;
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