H37: Using alt attributes on img elements

HTML Snippet Code
Scenario 1: Alternative text is empty for active image
<a href="http://www.deque.com"> <img src="../../../Resources/Images/logo.jpg" height="50px" width="140px" alt="" class="wcag-fail"/> </a>
Scenario 2: Placeholder text is used for alternative text
image <a href="http://www.deque.com"> <img src="../../../Resources/Images/logo.jpg" height="50px" width="140px" alt="image" class="wcag-fail"/> </a>
Scenario 3: Alternative text provided is not meaningful
!!@!! <a href="http://www.deque.com"> <img src="../../../Resources/Images/logo.jpg" height="50px" width="140px" alt="!!@!!" class="wcag-fail"/> </a>
Scenario 4: Alternative attribute is missing for the image
<a href="http://www.deque.com"> <img src="../../../Resources/Images/logo.jpg" height="50px" width="140px" class="wcag-fail"/> </a>

Deque Systems, Inc.