You can preview a page in a browser at any time; you don’t have to upload it to a web server first. When you preview a page, all browser-related functions should work, including JavaScript behaviors, document‑relative and absolute links, ActiveX® controls, and Netscape Navigator plug‑ins, provided that you installed the required plug‑ins or ActiveX controls in your browsers.
Before previewing a document, save the document; otherwise, the browser does not display your most recent changes.