panel.html
<button class="tlf-tagmark-bubble">+</button>
<div class="tlf-tagmark">
<button class="cancel">X</button>
<label>Tags: (comma, separated)<br>
<input type="text"name="tags" />
</label>
<label>Notes:<br>
<textarea name="notes"></textarea>
</label>
<button class="mark">Mark</button>
</div>