Tags: descriptive strings in angle brackets and angle brackets. It is just a label that tells the user how the agent, such as the browser, interprets the elements between tags.
Element: The content between the tag and the tag. Empty elements also require a closed-tag symbol, in two ways.
2, properties
Any tag can have an attribute, which takes the form of a "name/value" pair.
3. Markup Language
Sgml:standard Generalized Markup Language, Standard Universal Markup Language. A standard markup language for creating additional markup languages.
Html:html is much more than SGML, meaning size is just a fraction of SGML, and. It's very easy to learn. This is also the rapid popularity of HTMI, for the various types of people widely used reasons. HTML was created by Tzm Bemers-lee in 1991. At that time, HTML as a Professional markup page method, so that these pages can be in the professional community of the platform between the organization and delivery.
Xml
4. Create XML document
XML is case-sensitive. The nature of the genus must be enclosed in double quotes.
<?xml version= "1.0"?>
......
XML has been learned many times, here I only read it again, the rest is not written!
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