<div class="slide">
  <h4>intermezzo</h4>:
  <iframe width=100% height=300 src=@slide-sample-js-canvas.html></iframe>
  <br>
  now look at (video) interjection(s)
  </div>
  <div class=slide>
  <iframe  width=1024 height=620 src=@slide-sample-html-iframe.html></iframe>
  <!--
  <object type="text/html"  width=1024 height=600 data=@slide-sample-html-object.html></iframe>
  -->
     </div>