Pedagogical Examples in the Wild of
W3C Validator Used for Detecting Missing alt

Blue Ridge High School

Web I Tasks

Include at least one image on each explanation page...

Must include alt text...

Validate all of your pages using the W3C validator.

California State Polytechnic University

CIS 120 - Assignment 5 - HTML Basics

Be sure to include an <img tag(s) in the code you are creating to show at least one image on your page...

Finally use the W3C Markup Validation Service to check the syntax of your HTML code....

See 10 Common Validation Errors and How To Fix Them for ways to correct many of the errors that were found; especially note the "No ALT attribute added to images" error toward the end of the article.

City University of New York - Queens College

CS-081 Assignment 4

For images, you may put in img tags that use src="#" instead of the path to an actual image file. Be sure to put in an alt attribute with text to show what the image will be.

"The most important test is for you to click the XHTML link at the bottom of the page. This will submit your web page to the W3C Validator. Your code must validate with no errors or warnings in order for you to complete the assignment successfully.

Kennesaw State University

For each example follow these steps:


Document 1

Hint investigate the element (alt attribute)

Massachusetts Institute of Technology

For each example follow these steps:


Document 1

Hint investigate the element (alt attribute)

Montgomery College

CA272 Final Project Requirements

All images must include the "alt" attribute, except that icons or purely graphic elements may have an "empty" attribute without text. The alt text must be brief but sufficient to identify the image...

All pages must be entirely free of coding errors and validated using the W3C validator

North Seattle Community College

IT 111 Final Website Project

Use the W3C Mark Up Validator to validate all of the pages...

Four images included with accurate height, width, and alt attributes.

Rutgers University

In class activities lesson 3

As it stands, our use of the image tag will not pass muster if we submit our HTML to the W3C HTML validator because we left out an important piece of the inline image tag (the <IMG> tag), namely, the ALT attribute. ALT is used to specify alternative text that the browser can show if for some reason the image cannot be displayed (for instance, if image display has been disabled by the user in order to speed downloads on a slow connection, or the user has impaired vision and is therefore using a text-based reading machine to browse by listening). The ALT attribute also allows text-based indexing robots to record information about images in your document.

San Diego Mesa College

CBTE 162 - Web Page Design: Unit 6 Assignment

Create a webpage with the following characteristics:...

Has at least one picture with the appropriate alt attribute in the <img> element (see p. 237)..

Has passed the W3C Validator...

University of Arkansas

CIS 3453: WWW Programming

Markup code validated using W3C validator:


Image tags <img> must include the alt attribute

University of Missouri

Goal(s) for this Lesson:

Student will be able to insert an image onto their HTML page using the image tag and its related attributes (src, height, width, border, alt).

Student will be able to validate their HTML page using the W3C Validator (

Washtenaw Community College

HTML Lesson 3:

Locate at least one public domain graphic pertinent to your page content and include that in the page. Include the src, height, width, and alt attributes, as well as other necessary attributes. Alt text should be appropriate. ...

Validate your code at the W3C validator (