  <section>

        <div>Custom icon src</div>

        <paper-icon-button class="custom" src="https://assets-cdn.github.com/images/modules/logos_page/Octocat.png" aria-label="octocat"></paper-icon-button>

      </section>
    </column>

    <script>

      function clickAction(e) {
        var t = e.target;
        if (t.localName === 'paper-icon-button') {
          if (t.hasAttribute('disabled')) {
            console.error('should not be able to click disabled button', t);
          } else {
         