Tham khảo tài liệu 'html & css: the complete reference- p2', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 26 Part I Core Markup link A link tag specifies a special relationship between the current document and another document. Most commonly it is used to specify a style sheet used by the document as discussed in Chapter 4 link rel stylesheet media screen href type text css However the link tag has a number of other interesting possible uses such as to set up navigation relationships and to hint to browsers about pre-cacheable content. See the element reference in Chapter 3 for more information on this. object An object tag allows programs and other binary objects to be directly embedded in a Web page. Here for example a nonvisible Flash object is being referenced for some use object classid clsid D27CDB6E-AE6D-11cf-96B8-444553540000 width 0 height 0 id HiddenFlash param name movie value object Using an object tag involves more than a bit of complexity and there are numerous choices of technology including Java applets plug-ins and ActiveX controls. script A script tag allows scripting language code to be either directly embedded within script type text javascript alert Hi from JavaScript more code below script or more appropriately linked to from a Web page script type text javascript href script Nearly always JavaScript is the language in use though other languages such as VBScript are possible. style A style tag is used to enclose document-wide style specifications typically in Cascading Style Sheet CSS format relating to fonts colors positioning and other aspects of content presentation style type text css media screen hl font-size xx-large color red font-style italic all hl elements render as big red and italic style The use of this tag will be discussed in Chapter 4. Comments Finally comments are often found in the head of a document. Following SGML syntax a comment starts with -- and ends with -- and may encompass many lines -- Hi I am a comment -- -- Author Thomas A. Powell r- r-s r i i n a__ _ir X _ .
