Basic concepts of HTML
Source: Shangpin China |
Type: website encyclopedia |
Date: August 27, 2012
Hyper Text Markup Language (HTML) is a useful typesetting language for web page production Beijing Website Design The most basic elements. HTML is not a programming language. Mark or add tags to the document with HTML, so that the document can be published on the www. Documents prepared with HTML contain reference graphics and format tags. View these HTML documents with a Web browser.
HTML originated from the Standard General Markup Language (SGML) and was developed by Tim Berners Lee, the inventor of the Web, and Daniel W Connolly founded Yili, a markup language, in 1990. It is an application of SCML. WWW Association, as an international formal organization that formulates HTML standards, officially launched HTML version 1.0 in 1993, providing simple text format functions. In February 1995, the HTML 2.0 version was launched, adding functions such as table processing, graphics, and images.
HTML is a symbolic markup language used to represent online information. It uses explicit commands to describe the file format, and writes standardized tag commands in HTML files. Form HTM L documents. They are suffixed with. html or. htm. When the Web browser reads the HTM L document of a World Wide Web page from Wel and the server, it will re type and restore the read page according to the multiple tags in the HTML document and the size and resolution of the display used by the browser.
Learning HTML language is an important technical basis for understanding and implementing online marketing. HTML language helps people to master web page production technology, and HTML code is often involved when using search engines, e-mail and other common means of online marketing.
1 . HTML Identifier
HTML identifiers are letters or words placed in angle brackets, such as 。 HTML files can support many kinds of identifiers. Learning HTM L language is actually learning these various identifiers.
Most identifiers appear in pairs, including the start identifier and the end identifier. They define the scope of the identifier. The difference between them is that the end identifier has an additional slash than the start identifier, such as study The text "Learning" is displayed in bold without affecting the text other than the start identifier and the end identifier. Some identifiers have only a single identifier, such as line feed identifiers Many identifiers include some attributes, which control the content of the identifier in more detail. For example, the font size attribute of the font identifier specifies the size of the text, and the color attribute specifies the color of the text, such as: < FONT SIZE = 3 COLOR= green.> The font of this line is No. 3, and the color is green/ FONT> HTML identifiers are not case sensitive, but in order to facilitate the maintenance and striking of HTML documents, uppercase identifiers are usually used.
HTML comments are defined by the start identifier The content between these two identifiers is interpreted by the browser as a comment, and therefore is not displayed in the browser.
2. HTML syntax structure
A Web page corresponds to an HTML file. The basic structure of an HTML document consists of the document start and end tags, header tags, and body tags.
(1) Document start and end tags and
The and are the first and last identifiers of the HTML document. All the contents of the HTML document are in these two identifiers. These two identifiers tell the browser that the file is a Web page.
(2) Head marks and
The first tag is located at the beginning of the Web page, but does not include the actual content of the Web page. It is used to set the title of the page, define the style sheet (CSS), or insert script (Script). Among them, the most commonly used identifier is the title identifier Basic concepts of HTML - 上海1314龙凤鲜花坊_上海419贵族宝贝_上海品茶网
, used to define the title of the web page. The defined title is displayed in the title bar of the browser window.
(3) One mark and
The body tag contains the content of the Web page. The body contains text, pictures, links, tables, etc.
The basic structure of an HTML document is as follows:
One One One One One One One One One One One One One One One One One One One One One One One Document Start Identifier
One One One One One One One One One One One One One One One One One One One One One One One One One One One First Initial Identifier
Basic concepts of HTML - 上海1314龙凤鲜花坊_上海419贵族宝贝_上海品茶网
One One One One One One One One One One One One One One One Title End Identifier
One one one one one one one one one one one one one one one one one end identifier
One One One One One One One One One One One One One One One One One One Body Start Identifier
Text one one one one one one one one one one one one one one one one text end identifier One one one one one one one one one one one one one one one document end identifier
3. HTML file editing
The simplest way to create and edit an HTM L file is to write an HTM L identifier directly in the "Notepad" provided with Windows, and save it as a file format with an extension of "HTML" or "HTM". For example, write the code shown in Figure 5-13 into "Notepad" and save it as "index. html". Open it in the browser and see the effect as shown in Figure 5-14.
When writing HTML code in Notepad, it should be noted that "<>", "" "and other symbols are English punctuation marks, so that they can be displayed correctly in the browser.
In addition, if you want to view the source code of the HTML that opens the web page file in the browser. There are two methods: one is to right click the mouse and select the View Source command; Second, choose Select the Source command in the View menu of the browser.
4. Relative path and absolute path
HTML files can reference various external files, including HTML pages, audio, pictures, videos, etc. In order to indicate the location of the referenced file, it is necessary to indicate the location of the file through the path. There are two ways to write HTML: relative path and absolute path.
(1) Relative path
① File reference of the same directory
If the source file and the reference file are in the same directory, write the reference file name directly. Now create a source file, info.html. In info.html, reference the index.html file as a hyperlink.
Assume info The html path is: c: Inetpubwwwrootsitesblablainfo.html
Assume that the path of index. html is c: Inetpubwwwrootsitesblablaindex.html
The code of adding index. html hyperlink in info.html should be as follows:
index.html
② Indicates the parent directory
2. Roll up the directory above the directory where the source file is located,..// Indicates the superior directory of the directory where the source file is located, and so on.
Assume that the info.html path is: c: Inetpubwwwrootsitesblablainfo.html
Assume that the index.html path is: c: Inetpubwwwritsites index.html
The code of adding index.html hyperlink to info.html should be as follows:
index.html
Assume that the info.html path is: c: Inetpubwwwrootsitesblahlainfo.html
Assume that the index.html path is: c: Inetpubwwwrootindex. html
The code of adding index.html hyperlink to info.html should be as follows:
index.html
Assume that the info.html path is: c: Inetpubwwwrootsitesblahlainfo.html
Assume that the index.html path is: C: Inetpubwwwrootsiteswowstoryindex.html
The html path is: c: Inetpubwwwritsites
The code of adding index.html hyperlink to info.html should be as follows:
index.html< /a>
③ Indicates a subordinate directory
To reference a file in a lower level directory, write the path of the lower level directory file directly.
Assume that the info.html path is: c: Inetpubwwwrootsitesblablainfo.html
Assume that the index.html path is: c: Inetpubwwwroot sitesblablahtmlindex.html
The code of adding index.html hyperlink to info.html should be as follows:
Marketing website construction Company Shangpin China //ihucc.com/
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