Html Element Syntax

[shakil12345]

• An HTML element starts with a start tag / opening tag
• An HTML element ends with an end tag / closing tag
• The element content is everything between the start and the end tag
• Some HTML elements have empty content
• Empty elements are closed in the start tag
• Most HTML elements can have attributes
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[anilgangwar]

HTML and XHTML Syntax
Writing valid HTML (or XHTML) is not a terribly difficult task once you know what the rules are, although the rules are slightly more stringent in XHTML than in HTML. The list below provides a quick reference to the rules that will ensure your markup is well-formed and valid. Note that there are other differences between HTML and XHTML which go beyond simple syntax requirements; those differences are covered in HTML Versus XHTML.
The Document Tree
A web page is, at its heart, little more than a collection of HTML elements—the defining structures that signify a paragraph, a table, a table cell, a quote, and so on. The element is created by writing an opening tag, and completed by writing a closing tag. In the case of a paragraph, you’d create a p element by typing <p>Content goes here</p>.
The elements in a web page are contained in a tree structure in which html is the root element that splits into the head and body elements (as explained in Basic Structure of a Web Page). An element may contain other nested elements (although this very much depends on what the parent element is; for example, a p element can contain span, em, or strong elements, among others). Where this occurs, the opening and closing tags must be symmetrical. If an opening paragraph tag is followed by the opening em element, the closing tags must appear in the reverse order, like so: <p>Content goes here, <em>and some of it needs emphasis</em> too</p>. If you were to type <p>Content goes here, <em>and some of it needs emphasis too</p></em>, you’d have created invalid markup.
Case Sensitivity
In HTML, tag names are case insensitive, but in XHTML they’re case sensitive. As such, in HTML, you can write the markup in lowercase, mixed case, or uppercase letters. So <p>this is a paragraph</p>, as is <P>this example</P>, and even <P>this markup would be valid</p>. In XHTML, however, you must use lowercase for markup: <p>This is a valid paragraph in XHTML</p>.
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[Vmohil]

HTMl is Markup language , written in HTML elements consisting of tags enclosing with Angel brackets (<>) . Html tags Comes in Pair Like <b> and </b> Opening and Closing Tags . Yes Most of HTML elements have Attributes, properties like Anchor Text '<a href="abc.com" rel="nofollow"> ' have attribute 'href' that contains Url to navigate Page and 'rel' that shows whether link dofollow or no follow . HTML comes with New Version and Latest version is HTML 5 .

[nikkoncolmel]

the HTML syntax in detail. In places, it also notes differences between the the HTML syntax and the XML syntax, but it does not describe the XML syntax in detail (the XML syntax is instead defined by rules in the [XML] specification and in the [Namespaces in XML] specification).

This section is divided into the following parts:

1. The doctype
2. Character encoding declaration
3. Elements
4. Attributes
5. Text and character data



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