bigbluebutton-Github/labs/bbb-html5-client/public/templates/session_whiteboard.html

<div id="slide"></div>
<div id="slide-controls" style="clear:left">
  <canvas id="colour-view" width="12" height="12"></canvas>
  <div id="colour-picker">
    <input id="colour-text" maxlength="7" type="text">
  </div>
  <canvas id="thickness-view" width="20" height="20"></canvas>
  <div id="thickness-slider"></div>
  <button id="slide-clean-btn">Clean</button>
  <button id="slide-text-btn">Text</button>
  <select>
    <option value="14">14</option>
  </select>
  <button id="slide-undo-btn">Undo</button>
  <button id="slide-fit-to-page-btn">Fit to Page</button>
  <button id="slide-fit-to-width-btn">Fit to Width</button>
  <div id="slide-upload-controls">
    <p>Upload custom slides
      <form method="post" action="/upload" enctype="multipart/form-data" id="slide-upload-form">
        <input type="file" name="image" id="slide-upload-file">
      </form>
      <span id="slide-upload-status"></span>
    </p>
  </div>
<textarea autofocus="autofocus" id="slide-current-text-area"
          class="textinput" style="visibility:hidden;"></textarea>
</div>