Script.</li>
        <li><strong>Double-buffering</strong> - Minimizes page re-flows with
          this automatic feature. It can speed up some styling changes by more
          than 10x.</li>
        <li><strong>Merging and caching</strong> - Control when
          your styling is updated using time-based minimal processing.</li>
        <li><strong>Mixins</strong> - Create custom symbols at multiple levels:
          virtual stylesheet, virtual cascade, and global.
          Change a mixin and watch the 