In odoo-9 Options apply standard CSS classes to the snippet. Depending on the method that you choose, the UI will behave differently.
For example you can see below.

<template id="snippet_testimonial_opt" name="Snippet Testimonial Options" inherit_id="website_less.snippet_options">
  <xpath expr="//div[@data-js='background']" position="before">
    <div data-selector=".snippet_testimonial"> <!-- test group -->
      <li class="dropdown-submenu">
        <a href="#">test</a>
        <ul class="dropdown-menu"> <!-- Options list -->
          <li data-select_class="opt_shadow"><a>Demo image</a></li>
          <li data-select_class="opt_grey_bg"><a>Select your color</a></li>
          <li data-select_class=""><a>demo</a></li>
        </ul>
      </li>
    </div>
  </xpath>
 </template>