việc cài đặt và thực hiện tốt nhất là để lại cho những người có kinh nghiệm với ngôn ngữ và phương pháp mã nguồn mở. CMS cung cấp dịch vụ ứng dụng. Trong trường hợp này, thay vì cài đặt CMS trên máy chủ của bạn, nhà cung cấp cung cấp công nghệ cho bạn. | 156 Part II HTML XHTML CSS and Accessibility For an interesting and very detailed article on empty elements their history note and their quirks see Empty Elements in SGML HTML XML and XHTML by Jukka Korpela at jkorpela html . Secret 113 Managing Minimized Attributes A minimized attribute is one that is represented only by the attribute name. There s no associated value. In HTML familiar examples would include attributes such as the following noresize noshade nohref nowrap multiple checked ismap compact Here s a sample hr noshade In XHTML the minimization of attributes is disallowed. The attribute name is given a value of itself input type checkbox checked checked So in all cases where you find a single-word attribute you must give it a value of itself for the attribute to be valid in XHTML. During classes I often ask students to guess what the attribute value of a note minimized attribute becomes in XHTML. Many guess that the value is true which makes absolute sense. The selected attribute is considered a Boolean attribute and you can read more about their unique history and use at TR REC-html40 intro . Secret 114 Entities and XHTML Chapter 6 examined character entities and their role in HTML. Used for the display of special characters in both HTML and XHTML entities are also used in XHTML to escape certain characters in scripts and URLs. The best example of this is the ampersand which appears in JavaScript and also in some URLs. Chapter 7 Moving Ahead with XHTML 157 Because the ampersand is considered reserved for use the more rigid rules of XHTML expect you to escape all inline instances of ampersands not related to a special character. Take the following URL for example http books chapter 1 section 2 The ampersand must be escaped using the character entity http books chapter 1 amp section 2 The same is true in any inline or embedded JavaScript. Consider the following .
