Alt text
What do I need to do?
Include "alternate text" (alt text) for all images including graphs, pictures, logos, etc. Alt text provide users with a written description of visual images. For example, a picture of a golden retriever dog may have a alt text description stating “photograph of a golden retriever dog.”
How do I do this?
Every image or graphic should have corresponding alternative text describing the information conveyed by the image. Simple images (example, a logo) may require alt text that’s only a word or two, while more complex images (for example, a graph or flow chart) may require a more substantial description.
To add an alt tag to an image using Microsoft Office software, right click on the image and select 'Format Picture.' Click on the 'Web' tab and enter the desired alternative text, then click 'OK.'
Why is this important?
Either by choice or necessity, not everyone can see images on their screen. Screen readers rely on alternate text tags to convey information contained in graphical images. People using PDAs or cell phones with small screens will often disable graphics, as will people with slow internet connections. Alt text allows these users to understand images even when they can’t see them.
What is the source for this standard?
- Section 508 standard 1194.22(a): A text equivalent for every non-text element shall be provided (e.g., via "alt", "longdesc", or in element content).
- WCAG 2.0 Guideline 1.1 Text Alternatives: Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language.
Where can I get more information?
- Access-Ed Project: Writing Equivalent Text Descriptions
- Web Aim: Appropriate Use of Alternative Text
