A webpage should make sense even when someone cannot see its colors, pictures, or layout.
What You Need to Know
An accessibility regression check repeats familiar tasks before publishing changes. Test keyboard order, labels, error messages, and any dialogs after CSS or JavaScript updates—not only when the page is first built.
Try the Example
Take a look at the example. We’ll explain the important lines right below it.
<main>
<h1>Release checklist</h1>
<form action="/join" method="post">
<label for="email">Email</label>
<input id="email" name="email" type="email" required>
<button type="submit">Join</button>
</form>
</main>Let’s Read the Code
- <main>: The main element marks the primary page content.
- <h1>: A top-level heading explains what the page is about.
- for: For connects a label or output with a control by ID.
- id: An id uniquely identifies an element on this page.
What the example shows: Before publishing, repeat keyboard, focus, label, error, mobile reflow, and screen-reader checks after changes.
What Happens in the Browser?
Try this with Tab and Shift+Tab. If you can, inspect the accessibility tree too; appearance alone does not tell the whole story.
Try a different way of reading. Read only the headings and labels, or navigate through links without looking at the rest of the page. If the page still makes sense, the underlying HTML is probably doing an important part of its job.
Your Turn
Write a five-step accessibility regression checklist for this form.
Common Beginner Mistakes
- Judging the page only by how it looks, without checking its meaning and keyboard behavior.
- Passing a test last month does not guarantee a new UI update remains accessible.
Key Takeaways
- An accessibility regression check repeats familiar tasks before publishing changes.
- <main>: The main element marks the primary page content.
- A meaningful HTML element is usually a stronger starting point than adding an ARIA role to a generic div. Also check what happens using only the keyboard.