Different types of preview modes in browsers.
Preview from start:
Preview from current:
Preview from start, with sync:
You can also open the preview of the content by opening the context menu of the content on the Summary tab and select Preview in browser.
In the link of the preview you can set the following parameters:
autoSaved=true/false - To display the autosaved or finally saved version
noSync=true - To wait for content sync or not