- Creating server-side image maps: Learn how to create server-side image maps using popular graphics editors. - Using multiple `` tags: Understand the limitations and best practices when using multiple `` tags on a single page.

2026-03-155 min read

ismap (Web Development)

Learn ismap (Web Development) step by step with clear examples and exercises.

Title: Mastering the ismap Attribute in Web Development (HTML/CSS)

Why This Matters

The ismap attribute plays a significant role in web development, particularly when dealing with server-side image maps. It allows users to interact with specific areas within an image, redirecting them to various URLs or displaying different content upon click. Familiarizing yourself with the ismap attribute can help improve user interaction and navigation on your website.

Prerequisites

To fully understand this lesson, you should have a fundamental grasp of HTML, including:

Basic HTML tags (e.g., `, , `)
Links (`) and images (`)
Understanding the Document Object Model (DOM) and its role in web development
Familiarity with HTML attributes and their functions

Core Concept

The ismap attribute is used to declare an image as part of a server-side image map. When this attribute is added to an image, it enables clickable areas within the image that can be defined using the ` tag. Each ` tag specifies the coordinates and attributes for a specific clickable area within the image.

Here's a basic example of how to use the ismap attribute:

<img src="server-side-image-map.gif" ismap>

To define clickable areas, you can add ` tags within the ` section of your HTML document:

<img src="server-side-image-map.gif" ismap>
<map name="imageMapName">
<area shape="rect" coords="10,10,50,50" href="link1.html">
<area shape="circle" coords="60,20,10" href="link2.html">
</map>

In this example, the image (server-side-image-map.gif) is declared as an image map using the ismap attribute. The ` tag defines a named area for the image map, and the ` tags specify two clickable areas with their respective shapes (rectangle or circle), coordinates, and links.

Understanding the ``,` `, and` ` Tags

The ` tag defines a named area for the image map. It should be placed after the ` tag.
The ` tag with the ismap` attribute declares an image as part of a server-side image map.
The `` tag specifies the characteristics and coordinates of individual clickable areas within the image map.

Worked Example

Let's create an example using a simple image map that redirects users to different pages when they click on specific areas of the image:

First, create an image with distinct regions that can be clicked (e.g., using a graphics editor like Adobe Photoshop or GIMP). Save the image as image-map.gif.

Next, create an HTML file named index.html and include the following code:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image Map Example</title>
</head>
<body>
<h1>Welcome to the Image Map Example</h1>
<img src="image-map.gif" ismap>
<map name="imageMapName">
<area shape="rect" coords="10,10,50,50" href="page1.html">
<area shape="circle" coords="60,20,10" href="page2.html">
</map>
</body>
</html>

Create two additional HTML files (page1.html and page2.html) with some content for each page.

Open the index.html file in a web browser, and you should see your image map. Click on the defined areas to navigate to page1.html and page2.html.

Common Mistakes

**Forgetting the ` tag**: The ` tag is necessary for defining the named area of the image map. Make sure it's included in your HTML code.

Incorrectly specifying coordinates: Ensure that the coords attribute of the ` tag accurately defines the clickable area within the image. The format should be x1, y1, x2, y2`.

Using an incorrect shape: If your image map requires a shape other than rectangle or circle, you can use the poly attribute instead of rect or circle. However, this requires defining each point of the polygon using the coords attribute (e.g., coords="10,20 30,40 50,20").

Common Mistakes - Subheadings

Forgetting to close the ` tag: Don't forget to include the closing ` tag.
Using incorrect shapes or coordinates: Ensure that the shape and coordinates are accurate for each clickable area.
Overlapping clickable areas: Be mindful of overlapping clickable areas, as they may cause confusion or unexpected results.

Practice Questions

Create an image map with three clickable areas: a rectangle in the top left corner, a circle in the center, and a polygon covering the bottom half of the image. Each area should redirect to different pages when clicked.

What is the purpose of the ismap attribute in HTML? How does it differ from using the ` tag without the ismap` attribute?

FAQ

Can I use the ismap attribute with an image that isn't a server-side image map (e.g., a PNG or JPEG)? No, the ismap attribute can only be used with server-side image maps (usually GIFs).

How do I create a server-side image map? Server-side image maps are typically created using a graphics editor like Adobe Photoshop or GIMP, which allows you to define clickable areas within the image. You can then save the image as a GIF and use it with the ismap attribute in your HTML code.

**Can I use multiple ` tags on the same page?** Yes, you can have multiple tags on the same page, each with its own set of clickable areas. However, each tag should only be associated with one ` tag.

FAQ - Subheadings

Creating server-side image maps: Learn how to create server-side image maps using popular graphics editors.
Using multiple ` tags: Understand the limitations and best practices when using multiple ` tags on a single page.