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Do you know the difference between decorative, educational, and functional images and what that means for writing good alt text? Did you know that audio descriptions are mandatory for all live and pre-recorded videos?
Making your content accessible means more than just trusting web developers or checking a box for video comments and alt text. This means that content creators, including writers, graphic designers, photographers, and video editors, understand the guidelines, and most importantly, what those guidelines mean for how to implement content on your site.
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The World Wide Web Consortium’s Web Accessibility Initiative has developed the Web Content Accessibility Guidelines, or WCAG, to make the web more accessible for people with “a wide range of disabilities, including visual, auditory, physical, speech, cognitive, language, learning, and neurological impairments”.
The first set of guidelines – WCAG 1.0 – were released in May 1999. They were updated to WCAG 2.0 in December 2008 and WCAG 2.1 in June 2018. WCAG 2.2 is scheduled for publication in June 2022 and WCAG 3.0 is scheduled for publication in a few years.
Something to know about WCAG updates. It is always backward compatible. Therefore, if you meet WCAG 2.1, you will also comply with the WCAG 2.0 guidelines.
For each version of the WCAG Guidelines, there are three levels of success criteria – A, AA, and AAA.
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Most government standards currently require sites to meet WCAG 2.1 Level AA standards. At this time, all projects with a design or development component are committed to achieving WCAG 2.1 Level AA compliance.
Now that you understand a bit about the guidelines and their background, let’s see what this really means for your site.
Most people already know that subtitles are mandatory for all videos. To meet AA requirements, you must provide captions on all live and pre-recorded videos. To meet the enhanced AAA standard, sign language interpretation is necessary.
What most people don’t know is that audio descriptions are also required for all pre-recorded and live videos to meet the AA standard. To meet the Enhanced AAA standard, extended audio descriptions are required for all videos.
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But what are audio descriptions? Audio feedback that provides information about visual elements in a video to help blind and visually impaired users.
Here’s an example of the difference an audio description can make in understanding what’s going on in a video.
Another thing you should know about videos is that they must have controls even in their background videos. To meet minimum level A standards, pause and stop buttons are required for all autoplay audio and video files. To meet level AAA, it is necessary to control the background sound.
It’s not just the videos where you need to think about the controls. For animated animations that are triggered by interactions, such as an image that moves when you scroll or scroll, to meet AAA level standards, you need to provide a way to disable these animations.
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Finally, bright lights are also something to be aware of because they can cause headaches, nausea, dizziness, or even photosensitivity attacks in people who may not even have a seizure disorder. For A level, you can have no more than three flashes less than the general flash limit and a red flash in any one second period. For level AAA, you cannot have anything that flashes more than three times in any one second period.
A best practice when using images on the web is not to use text-dense images or text-dense graphics when possible. In fact, to meet AAA level standards, all images that contain text must be ornate.
For decorative images, since they do not add any information to the content, you should use the empty alt=””) attribute instead of the alt text.
Alt text for informational images should convey the meaning or content displayed visually, but generally not a literal description of the image.
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The alt text for functional images should convey the action to be initiated (the purpose of the image), rather than describing the image.
The W3C also has an excellent alt text decision tree that can help guide you through the process of deciding what type of image and what type of alt text is needed.
To help people with cognitive and learning disabilities, you should use standard symbols and symbols that people already know — such as play, print, email, calendar, and looking up at the magnifying glass — so they don’t have to learn new symbols.
But even if you use these recognizable icons, you should at least include a functional alt text, or better yet, include a visual text label.
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Knowing when you need to write alt text is great, but knowing what to write for that alt text is even better. When deciding whether to include “alt” text, the surrounding context makes a difference.
You could try using Alex Chen’s Object-Action-Context method, where the alt text you type describes the main focus of the image, what that main focus does, and the environment around the main focus.
It is also important to understand the context of the content around the image. It can help you decide which alt text is best for your image.
Good alt text: pancakes | Better alternative text: Hand holding a white plate with a pile of blueberry pancakes topped with raspberries and strawberries
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If you’re writing a story about different types of breakfast foods, a “good” pancake alternative text might suffice to describe the picture. But if you’re talking about different types of pancakes, you’d probably use the “best” description for “a pile of blueberry pancakes with powdered sugar.”
The same goes for the image of a rooster. If you are talking about different types of barnyard animals in general, it may be appropriate to say that the image is a rooster. But if you’re talking about the different sounds that barnyard animals make, using “cockcrow” might be better. Finally, if you are talking about different types of rooster, using the “red-crowned rooster” may be best.
While you may have the time and ability to describe each image in detail, if you don’t, you must provide the level of detail that fits the context of the surrounding content.
There is discussion about the maximum number of characters you should have in alt text. Some accessibility recommendations suggest using less than 125 characters for alt text because screen readers may stop reading if it is longer than that. But some users tested this theory and found it incorrect, so this limit may be for SEO purposes only.
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Regardless of whether there is an actual 125-character cutoff, you should try to make the alt text as short and concise as possible. If you need more than 200 characters to explain the image, you may want to adjust the content around the image to provide better context.
When it comes to describing people in alt text, you have to be careful. You can accurately describe someone’s clothing or hair style, but you may not be able to tell details about a person. Appearances can be deceiving. You may not be able to accurately determine a person’s race, ethnicity, gender identity, or ability based on appearance alone.
Unless these details are relevant to the context of the surrounding content, you should probably avoid including them. If you want to include it, you should always try to ask the person specifically how they would describe themselves.
To make your text easier to access, you need to use simple and clear language. Use easy words in short sentences and text blocks. To meet the AAA level standard, the reading level must be no higher than eighth grade (lower
