chi phí thấp hơn, và thường hỗ trợ tuyệt vời mà đi với dịch vụ. Tuỳ chỉnh CMS phát triển. Một lập trình tốt có thể tạo ra một CMS từ đầu hoặc tùy chỉnh một từ bất kỳ số nguồn mở tùy chọn cho ít tiền hơn. Những bất lợi củaCông cụ, Kế hoạch và Nội dung | 244 Part II HTML XHTML CSS and Accessibility Accessibility has become a critical component of Web design. This is especially true for those designers working in government and education where specific laws may require those designers to implement accessibility features. Creating accessible Web sites is not a difficult thing to do really if you have developed sound markup practices and reduced or removed the use of tables for layout from your designs. After that it s a matter of applying certain elements and attributes to your documents providing alternatives to aural or visual media and properly testing your documents for accessibility compliance. What is Web Accessibility The term accessibility is used to describe a specific problem within Web design how to make Web sites available to those who have disabilities that might prevent them from seeing hearing and moving through Web pages. A significant number of disabilities impact use of the Web including those related to vision hearing and mobility. Some visually challenged individuals rely on large-type high-contrast operating system and Web browser features to access pages. Many visually challenged people use screen reader technology a combination of hardware and software that reads screen content aloud. Braille printers are also common where screen data is interpreted by the printer and then printed out. People with mobility impairments may use special keyboards mice and pointing devices such as special sticks held in the mouth or placed on the forehead for tapping out keyboard commands . Other devices exist as well but in all cases using these devices referred to as assistive devices on the types of Web pages dominating the Web is no easy task. For an excellent overview of this topic see How People with Disabilities Use note the Web from the W3C at WAI EO Drafts PWD-Use -Web . Another accessibility concern is comprehension. Even a physically healthy bright person requires clear communication on the .
