Sachsentext

All "input" elements with a type of "image" must have an "alt" attribute which is not the same as the filename

All input elements with a type of "image" should have an "alt" attribute, and that attribute should not just be the file name.

Example

Wrong

<input type="image" name="search" src="select_home.png" alt="select_home.png"/>

Right

<input type="image" name="search" src="select_home.png" alt="Select house"/>