When using the ac:tooltip attribute on an ac:link element, the tooltip does not display when viewing the page. It will only be displayed while you are still editing, before saving.

After saving, the tooltip doesn't display any data for the links. Here's the steps to reproduce:

1. In a page, create/insert a new link
2. By using Confluence Source Editor apply the ac:tooltip parameters to the link, so it should display the information. In example, the source code below:

   <p>Text on the page: <ac:link ac:tooltip="Text for tooltip">
       <ri:page ri:content-title="Page Tittle"/>
     </ac:link>
   </p>
   

3. While you have not saved the page, stop the cursor on the link (the tooltip will be displayed)
4. Save the page and stop the cursor in the link again
5. No tooltip displayed