The F8 key can be used to preview the current document in HTML-Kit using the default browser. This FAQ describes how to change the default browser on the system.
Supporting different screen sizes while maintaining the original look-and-feel envisioned for a site is not always easy. HTML-Kit provides multiple options for quickly changing the size of the preview window to make it easier to test pages at pre-set and custom resolutions.
Although it's possible to preview pages in Internet Explorer and Mozilla/Gecko modes inside HTML-Kit while editing pages, testing the final version of pages in external browser windows is a good practice. This FAQ describes how to preview in browsers installed on the system.