TAILIEUCHUNG - creating cool web sites with html xhtml and css apr 2004 phần 9

và bạn thấy rằng điều này ký hiệu dấu chấm (có nghĩa là, tách các yếu tố với một khoảng thời gian) có ý nghĩa. Trong thực tế, bằng cách sử dụng một giá trị ID duy nhất, tất cả các bạn thực sự có trong dòng trước những điều sau đây: | Chapter 15 Thinking about Your Visitors and Your Site s Usability The site is clean open inviting and has a small number of links off this page so that the user isn t completely overwhelmed by the choices. Very nice Compare this with the . Social Security Administration Web site as shown in Figure 15-2. Here you can see many more choices. The designer seems unable to differentiate between what I call the musts and the wants. The musts are those links that must be on the home page or for that matter on the specific page in question whatever it is. The wants on the other hand are those links that would be helpful to have up-front but are not critical. Remember the guideline here is to minimize the amount of information presented. Less is more. Figure 15-2 The Social Security Administration Web Site-pretty overwhelming at first glance. To help achieve this minimization keep these points in mind Use concise wording. Use tables with column headings where appropriate. Use familiar data formats. Avoid unnecessary detail. Use abbreviations appropriately. 326 Creating Cool Web Sites with HTM L XHTM L and CSS I To find out more about enhancing the usability of your Web site I recommend an note excellent book on human-computer interaction A Guide to Usability edited by Jenny Preece Addison-Wesley . Organize information on the page Another common mistake made on Web sites is the lack of any coherent organization. By organizing links and material you significantly help the user find what he seeks. Although the Social Security page in Figure 15-2 has too much information it is nonetheless a fine example of how grouping information can help make a Web page more usable. Notice the four key areas on the site entitled Retirement and Medicare Disability and SSI Widows widowers and other survivors and Get help with your situation. What I also really like about this page is that everything is written in an active manner it s engaging and it refers to me the visitor. It doesn t say .

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