# Creating and editing Web pages - overview

To aid in Web site development and editing, there is local tag hover help for all supported tag sets, as well as content assist (Ctrl+Spacebar), a tool that helps you insert or finish a tag or function or finish a line of code in a structured text editor.

You can toggle among various viewing modes (which are determined by file type) to visually design pages, work with HTML, JavaScript™ or JSP content, and preview your pages. To help you create the visual impact you want on your Web sites, the editor includes its own library of reusable graphics and two graphic programs for creating, editing, and animating image files.

Note: Use either uppercase or lowercase alphanumeric characters consistently when naming HTML files and embedded files (such as image files) used in your Web pages, because some server operating systems are case sensitive. Do not use spaces or special characters such as exclamation points or question marks in file names.
Related concepts
Web application overview