Adding in HTML/CSS code to the source editor on a page does not always provide the desired result. With tables for example it is possible to alter the table appearance using the source editor and it appears in the editing window. As soon as the changes are saved and the page is displayed these customisations are wiped. Going back into the edit view and then the source editor reveals that all the added HTML/CSS has been removed.

This is understandable if it breaks the underlying code of Confluence, but it is happening when adding in simple features such as a colour change or specifying the width of a table.

This has proved problematic when displaying large amounts of documentation information for reference, most of which needs to be in a consistent custom format.

To replicate:
Create a page, save it and then go back to edit to get access to the Source Editor code button.

Add some customisations to a table or section of text, such as colour change using HTML. Preview the page to see the changes in effect.

Save page, once the page is displayed all previewed changes are lost.

Go back in to edit the page and open up the source editor to see all added in changes wiped.