pan> <span class="parameter-name">background</span></span>)
      
    </section>
    <section class="desc markdown">
      <p>Combine the foreground color as a transparent color over top
of a background color, and return the resulting combined color.</p>
<p>This uses standard alpha blending ("SRC over DST") rules to produce a
blended color from two colors. This can be used as a performance
enhancement when trying to avoid needless alpha blending compositing
operations for two things that are solid colors w