Core Attributes:
The four core attributes that can be used on the majority of HTML elements (although not all) are:
- id
- title
- class
- style
The id Attribute:
The id attribute can be used to uniquely identify any element within a page ( or style sheet ). There are two primary reasons that you might want to use an id attribute on an element:
- If an element carries an id attribute as a unique identifier it is possible to identify just that element and its content.
- If you have two elements of the same name within a Web page (or style sheet), you can use the id attribute to distinguish between elements that have the same name.
- We will discuss style sheet in separate tutorial. For now, the id attribute could be used to distinguish between two paragraph elements, like so: <p id="html">This para explains what is HTML</p> <p id="css">This para explains what is Casecading Style Sheet</p>
- Note that there are some special rules for the value of the id attribute, it must:
- Begin with a letter (A.Z or a.z) and can then be followed by any number of letters, digits (0.9), hyphens, underscores, colons, and periods.
- Remain unique within that document; no two attributes may have the same value within that HTML document.
The title Attribute:
The title attribute gives a suggested title for the element. They syntax for the title attribute is similar as explained for id attribute:
The behavior of this attribute will depend upon the element that carries it, although it is often displayed as a tooltip or while the element is loading.
For example: <h4 title="Hello HTML!">Titled Heading Tag Example</h4>
Above code will generate following result: Titled Heading Tag Example
Now try to bring your cursor over "Titled Heading Tag Example" and see the result.
The class Attribute:
The class attribute is used to associate an element with a style sheet, and specifies the class of element. You learn more about the use of the class attribute when you will learn Casecading Style Sheet (CSS). So for now you can avoid it.
The value of the attribute may also be a space-separated list of class names. For example: class="className1 className2 className3"
The style Attribute:
The style attribute allows you to specify CSS rules within the element. For example: <p style="font-family:arial; color:#FF0000;">Some text...</p>
Internationalization Attributes:
There are three internationalization attributes, which are available to most (although not all) XHTML elements.
- dir
- lang
- xml:lang
The dir Attribute:
The dir attribute allows you to indicate to the browser the direction in which the text should flow.The dir attribute can take one of two values, as you can see in the table that follows: Value Meaning ltr Left to right (the default value)
rtl Right to left (for languages such as Hebrew or Arabic that are read right to left)
Example: <html dir=rtl> <head> <title>Display Directions</title> </head> <body> This is how IE 5 renders right-to-left directed text. </body> </html>
When dir attribute is used within the <html> tag, it determines how text will be presented within the entire document. When used within another tag, it controls the text's direction for just the content of that tag.
The lang Attribute:
The lang attribute allows you to indicate the main language used in a document, but this attribute was kept in HTML only for backwards compatibility with earlier versions of HTML. This attribute has been replaced by the xml:lang attribute in new XHTML documents.
When included within the <html> tag, the lang attribute specifies the language you've generally used within the document. When used within other tags, the lang attribute specifies the language you used within that tag's content. Ideally, the browser will use lang to better render the text for the user.
The values of the lang attribute are ISO-639 standard two-character language codes.Check HTML Language Codes: ISO 639 for a complete list of language codes.
Example: <html lang=en> <head> <title>English Language Page</title> </head> <body> This page is using English Language </body> </html>
The xml:lang Attribute:
The xml:lang attribute is the XHTML replacement for the lang attribute. The value of the xml:lang attribute should be an ISO-639 country code as mentioned in previous section.
Generic Attributes:
Here's a table of some other attributes that are readily usable with many of HTML's tags.
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Attributes
|
Option
|
Function
|
|
Align
|
Right, Left,
Center
|
Horizontally Aligns
Tags
|
|
Valign
|
Top, Middle,
Bottom
|
Vertically
Aligns Tags Within An Html Element.
|
|
Bgcolor
|
Numeric,
Hexidecimal, Rgb Values
|
Places A
Background Color Behind An Element
|
|
Background
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Url
|
Places An
Background Image Behind An Element
|
|
Id
|
User Defined
|
Names An
Element For Use With Cascading Style Sheets.
|
|
Class
|
User Defined
|
Classifies An
Element For Use With Cascading Style Sheets.
|
|
Width
|
Numeric Value
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Specifies The
Width Of Tables, Images, Or Table Cells.
|
|
Height
|
Numeric Value
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Specifies The
Height Of Tables, Images, Or Table Cells.
|
|
Title
|
User Defined
|
"Pop-Up"
Title For Your Elements.
|
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Dear Visitors All The Tricks And Hacks Posted Here Are Only For Knowledge Purpose.Don't Use These for Illegal Operations.