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HTML Attributes

We've seen a few HTML tags and how they're used, such as the heading tags <h1> and <h2>, the paragraph tag <p>, and others. We've only seen them in their most basic form thus far, but most HTML tags can also have attributes, which are further pieces of information.

An attribute is a type of attribute that is used to define the properties of an HTML element. A name and a value are the two elements of every attribute.

The name is the name of the property you want to change. For instance, consider the paragraph.

The align attribute on the element in the example can be used to indicate the alignment of paragraphs on the page.

The value is what you're after the property's value to be, it must always be in quotations.

The names and values of attributes are case-insensitive. In its HTML 4 suggestion, the World Wide Web Consortium (W3C) proposes lowercase attributes/attribute values.

Example :

<!DOCTYPE html> 
<html>
   <head> 
      <title>Align Attribute  Example</title> 
   </head>
	
   <body> 
      <p align = "left">This is left aligned</p> 
      <p align = "center">This is center aligned</p> 
      <p align = "right">This is right aligned</p> 
   </body>
	
</html>

Try with example

Output:

Core Attributes

The four core attributes that could be used on the vast (but not all) of HTML elements are:

Id
Title
Class
Style

The Id Attribute

Any element within an HTML page can be designated using the id attribute of an HTML tag. There are two key reasons why you should employ an id attribute on an element:

It is feasible to identify only that element and its content if it has an id attribute as a unique identifier.

You can use the id attribute to differentiate between items having the same name on a Web page (or in a style sheet).

If an element have an id attribute as a unique identifier, it is possible to identify, 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 css tutorial. For now, let's use the id attribute to differentiate between two elements as shown below. We are using <p> element, you can do with any elements.

Example

<!DOCTYPE html> 
<html>
   <head> 
      <title>Page Title</title> 
   </head>
	
   <body> 
      <p id = "html">This para explains what is HTML</p>
      <p id = "css">This para explains what is Cascading Style Sheet</p>
   </body>
	
</html>

Try with example

The Title Attribute

The element's title is suggested by the title attribute. The title attribute has the same syntax as the id attribute. The function of this attribute depends on the element that contains it, however it is frequently displayed as a tooltip when the mouse passes over the element or while it is loading.

If you hover your cursor over "Title of HTML," you'll observe that any title you specified in your code appears as a tooltip for the cursor.

Example :

<!DOCTYPE html>
<html>
   <head>
      <title>The title Attribute Example</title>
   </head>
	
   <body>
      <h3 title = "Hello HTML!">Titled Heading Example</h3>
   </body>
</html>

Try with example

Output :

Titled Heading Example

Now try to bring your cursor over "Title of HTML" and you will see that whatever title you used in your code is coming out as a tooltip of the cursor.

The Class Attribute

The class attribute gives the element's class and is used to connect it with a style sheet. When you study Cascading Style Sheets, you'll learn more about how to use the class attribute (CSS). So, for the time being, you can avoid it.

A space-separated list of class names can also be used as the attribute's value.

class = "className1 className2 className3"

The style Attribute

Within the element, the style attribute allows you to specify Cascading Style Sheet (CSS) rules.

<!DOCTYPE html>
<html>
   <head>
      <title>The style Attribute</title>
   </head>
	
   <body>
      <p style = "font-family:arial; color:#FF0000;">Some text...</p>
   </body>
	
</html>

Try with example

Internationalization Attributes

There are three internationalization attributes, which are available for most (although not all) XHTML elements.

dir
lang
xml:lang

The dir Attribute

The dir attribute allows you to inform the browser which way the text should flow. As you can see in the table below, the dir attribute can take one of two values.

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

<!DOCTYPE html>
<html dir = "rtl">
   <head>
      <title>Display Directions</title>
   </head>
	
   <body>
      This is how IE 5 renders right-to-left directed text.
   </body>
	
</html>

Try with example

This will produce the following result −

The lang Attribute

The lang attribute lets you specify the official language in a document, although it's only in HTML for reusability with older versions of the language. In new XHTML pages, this attribute has been superseded with the xml:lang attribute.

Example

<!DOCTYPE html>
<html lang = "en">

   <head>
      <title>English Language Page</title>
   </head>

   <body>
      This page is using English Language
   </body>

</html>

This will produce the following result −

This page is using English Language

The xml:lang Attribute

The xml:lang attribute takes the place of the lang attribute in XHTML. As noted in the preceding section, the value of the xml:lang attribute should be an ISO-639 country code.

Generic Attributes

Here's a list of some more properties that can be used with a variety of HTML tags.

align	right, left, center	Horizontally aligns tags
valign	top, middle, bottom	Vertically aligns tags within an HTML element.
bgcolor	numeric, hexadecimal, RGB values	Places a background color behind an element
background	URL	Places a background image behind an element
id	User Defined	Names an element for use with Cascading Style Sheets.

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