HTML Attributes

Attributes provide additional information about HTML elements.
HTML Attributes:
HTML elements can have attributes
Attributes provide additional information about the element
Attributes are always specified in the start tag
Attributes come in name/value pairs like: name="value"

Attribute Example

HTML links are defined with the <a> tag. The link address is provided
as an attribute:

<a href="http://learn-html-khan.blogspot.com">This is a link</a&gt

Always Quote Attribute Values

Attribute values should always be enclosed in quotes.

Double style quotes are the most common,
but single style quotes are also allowed.

In some rare situations, like when the attribute value itself contains
quotes, it is necessary to use single quotes:

name='John "ShotGun" Nelson'

HTML Tip: Use Lowercase Attributes

Attribute names and attribute values are case-insensitive.

However, the World Wide Web Consortium (W3C) recommends lowercase
attributes/attribute values in
their HTML 4 recommendation

Newer versions of (X)HTML will demand
lowercase attributes.

HTML Attributes Reference

A full list of legal attributes for each HTML element is listed in given link below:

Complete HTML Reference

Below is a list of some attributes that are standard for most HTML elements:

Attribute	Value	Description
class	class_rule or style_rule	The class of the element
id	id_name	A unique id for the element
style	style_definition	An inline style definition
title	tooltip_text	A text to display in a tool tip

For more information about standard attributes a link is given below

HTML Standard Attributes Reference