How-to display a Javascript-Widget (e.g. from tripadvisor) in an GWT HTML Widget?

I want do display e.g. the following widget in an GWT HTML-widget:

<div id="TA_cdswritereviewlg303" class="TA_cdswritereviewlg">
<ul id="PFAsdj" class="TA_links xWEBQ5e">
<li id="nvVscFx" class="cSICfMRvGlKe">Review <a href="http://www.tripadvisor.com.au/Hotel_Review-g190454-d206597-Reviews-Grand_Hotel_Wien-Vienna.html">Grand Hotel Wien</a></li>
</ul>
</div>
<script src="http://www.jscache.com/wejs?wtype=cdswritereviewlg&amp;uniq=303&amp;locationId=206597&amp;lang=en_AU&amp;border=true"></script>

The widget id displayed fine here:
http://www.w3schools.com/html/tryit.asp?filename=tryhtml_intro

But on GWT I don't see the widget. Only the Text.

In previous projects I inserted iframes in GWT HTML-widgets and it worked fine.
How can I display this javascript-widget above in an GWT HTML-Widget?

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