By default, the page processor removes unsafe content, such as <embed>, <script>, <object>, <iframe>, etc. This helps to ensure a safe online community exerience. To add unsafe content to a page, use one of the following features:
The unsafe.html extension allows users to add unsafe HTML content to wiki pages; refer here for more information. Only enable this extension if you trust all your contributors.
The editor setting allows unsafe content by anyone, anywhere on the site. Only use this setting if you trust all your contributors. To enable:
1. Open your wiki and select Tools->Control Panel (administrator access is required).
2. Select Configuration.
3. Enter the following config setting: config key=editor/safe-html, config value=false.