Well-structured pages help you deliver ideas effectively and help the reader navigate through your site. Text on Web pages should be easy to read. If you add a background to your Web page, it should contrast with the text color. Web pages may not look the same in different Web browsers. It's a good idea to plan your Web pages so they are viewable in most browsers.
Large images increase download time, especially for readers who gain access to Web pages by modem.
Although graphics can make Web pages more interesting, you should use graphics strategically. Some users turn off the display of images, and some Web browsers don't support all video formats. When images and videos contain information that you don't want readers to overlook, you can use alternative text for graphics and alternative text and images for videos. You can use tables as a layout tool.