chrome/browser/resources/net_internals/export_view.html

<style>

.export-view-explanation-warning {
  border: 2px solid #e00;
}

#export-view-privacy-warning {
  padding: 5px;
  color: #e00;
  border: 1px solid #e00;
}

#export-view-save-log-file {
  font-size: 100%;
  font-weight: bold;
}

#export-view-user-comments {
  max-width: 100%;
}

</style>

<div id=export-view-tab-content class=content-box>
  <div>
    <input id=export-view-privacy-stripping-checkbox type=checkbox checked=yes>
    <label for=export-view-privacy-stripping-checkbox>
      Strip private information (cookies and credentials).
    </label>
    <div id=export-view-privacy-warning style="display:none">
      <b>WARNING</b>: Events were captured while full byte logging was enabled.
      This means the dump may contain private information.
    </div>

    <div style='margin-top:10px; margin-bottom: 5px'>
      <textarea cols=50 rows=5 placeholder="Explain what went wrong here. (These notes will be included in the dump file. Be sure to mention the specific URLs, so investigators know what to look for!)" id=export-view-user-comments></textarea>
    </div>
    <button id=export-view-save-log-file>Save to file</button>

    <pre id=export-view-save-status-text></pre>

    <div style='margin-top: 10px; margin-left: 10px;'>
      <a href="https://sites.google.com/a/chromium.org/dev/for-testers/providing-network-details" target="_blank">
        How to provide data for bug reports
      </a>
    </div>

  </div>

  <a style="display: none" id=export-view-download-anchor download="net-internals-log.json"></a>

</div>