Site root–relative paths describe the path from the site’s root folder to a document. You may want to use these paths if you are working on a large website that uses several servers, or one server that hosts several sites. However, if you are not familiar with this type of path, you may want to stick to document-relative paths.
A site root–relative path begins with a leading forward slash, which stands for the root folder of the site. For example, /support/tips.html is a site root–relative path to a file (tips.html) in the support subfolder of the site’s root folder.
A site root–relative path is often the best way to specify links if you frequently move HTML files from one folder to another in your website. When you move a document that contains site root–relative links, you don’t need to change the links; for example, if your HTML files use site root–relative links for dependent files (such as images), then if you move an HTML file, its dependent-file links are still valid.
However, when you move or rename the documents targeted by site root–relative links, you must update those links, even if the documents’ paths relative to each other haven’t changed. For example, if you move a folder, you must update all site root–relative links to files in that folder. (If you move or rename files using the Files panel, Dreamweaver updates all relevant links automatically.)