n>
    </div>
    <noscript>
      <div style="color:red; text-align:center;">
        This simulation needs JavaScript
      </div>
    </noscript>
    <canvas class="emscripten" id="canvas" tabindex=-1></canvas>

    <div class="emscripten" style="padding: 5px;">
    [space] pause, [click] draw a bubble
    </div>
    <div class="emscripten" style="padding: 5px;">
      <input type="button" class="button" id="button_pause" value="pause" onclick="TogglePause();">
      <input type="button" class="button" v