Preview a page in your Browser

Select File->Preview in Browser->Default Browser (F5) to preview the current page in your default browser. It's also possible to change the browser that is used for previewing. Go to File->Preview in Browser->Edit Browser List to add/edit the list of browsers that can be used to preview the pages you are working on.
 
Depending on the preview scope (Tools->Options->Misc), you can either preview a single page or the entire web site.
Important notes:
Internal links do not work in Preview, unless you have set the Preview Scope to Entire Web Site!
If you only preview a single page, your browser will not be able to find all the other (internal) pages unless you also generate them!
You cannot preview pages with PHP in your browser. They can only be viewed on a webserver with PHP support!

Tip:
You can change the default web browser in the Windows Control Panel!
What to do when preview doesn't work?
Some users have accidently assigned the wrong application to the HTML file type. In that case Windows will display the HTML page in another application. Follow these steps to correct this:

Step 1
In the Windows Control Panel click 'Folder Options'
Step 2
Find the HTML file type, click 'advanced', select 'open' and click 'edit' to change the default application.
Step 3
Browse for the application that should open the HTML file on preview.
In most cases this is Internet Explorer:
"C:\Program Files\Internet Explorer\IEXPLORE.EXE" %1