in Simple pages

I'm trying to embed a visualization from Tableau, which is in javascript in simple pages. Does the default setting support <script> for javascript? I'm using omeka 2.0. It hasn't working for me so far, and when I revisit the html, the script tag is already gone. Thanks.

Have you seen this recent post about similar issues?

I tried turning off the filter and security settings, but so far, no luck. I would really appreciate any assistance in embedding javascript in simple pages or anywhere in Omeka 2.0. Thank you!