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ID

Is used to specify a unique id for an HTML element

The value of the id attribute must be unique within the HTML document

Is used to point to a specific style declaration in a style sheet

Is used by JS to access and manipulate the element with the specific id

CSS Syntax : #IdName{…}

Id name is case sensitive, it must contain at least one character, can’t start with number, and must not contain whitespace

HTML bookmarks with Id and links

<h2 id="”C4”">Chapter 4</h2>
/* Add a link to the bookmark, from within the same page */
<a href="”#C4”">Jump to Chapter 4</a>
/* from another page */
<a herf="”html_demo.html#C4”"> Jump to Chapter 4</a>

Class

Is used to specify a class for an HTML element

Multiple HTML elements can share the same class

Is often used to point to a class name in a style sheet

Can also be used by a JavaScript to access and manipulate elements with the specific class name

Can be used on any HTML element, and is case sensitive

CSS Syntax : .className{…}

Different elements cans share same class

Multiple classes

• HTML elements can belong to more than one class

• To define multiple classes, separate the class names with a space

• The element will be styled according to all the classes specified

<div class="”main" sub”></div>