By default, the 'Create new revision' checkbox on the 'Revision Information' tab is selected in the creation/editing screen of a page, so that every time a node is updated it creates a new revision. This allows you to track how the node has changed over time on your site.
You can optionally include a description of the changes you are making in the 'Revision log message' text area. This message will be displayed on the 'Revisions' tab of the piece of content.
When a revision has been created, the 'Revision' tab for a node is available when you are logged in to the website, viewing the node.
- Click on the 'Revisions' tab to view a list of revisions.
- Use the circular buttons to select two revisions to compare and then click the 'Compare' button.
You should now see a side-by-side comparison of the revisions. This view uses the Standard display.
- [Optional] You can change the display used for the comparison by clicking the links in the upper-left corner.
Reverting to a revision
Reverting to a previous revision is useful when undesired changes have been made to a piece of content.
To revert to a specific revision, click on the corresponding 'Revert' link on the 'Revisions' tab of the piece of content.
This will create a new revision.