A webpage is not always broken because of a large mistake. Small details can produce exactly this problem: debugging: keyboard focus gets trapped. This guide shows you what to look for, a concrete fix, and how to check that it worked.
The Idea in Plain English
A scripted keyboard trap may prevent Tab and Shift+Tab from reaching the rest of the page. Native controls and dialog focus behavior are safer starting points.
You can test this using a small local HTML file. Change one part at a time and check the result in the browser before adding more code.
A Working Example
The first part shows a problem. The second part shows a safer or more accurate version. Compare them before reading the explanation.
<!-- Problem -->
<div tabindex="0">Menu content without real controls</div>
<!-- Corrected example -->
<nav aria-label="Main">
<a href="/">Home</a>
<a href="/about">About</a>
</nav>What Each Part Does
- The anchor is a link when its href points to a destination.
- A div groups content without adding a special meaning.
- The nav landmark groups important navigation links.
- aria-label can supply an accessible name when appropriate.
- href is the URL or fragment destination of a link.
Before the fix, the browser can behave incorrectly or report a warning. After the change, test the exact failure rather than assuming the page is fixed.
Try It Yourself
Use Tab and Shift+Tab through the whole interface; never require a mouse to escape.
Common Beginner Mistakes
- Check the underlying cause before changing unrelated tags.
- Changing several parts of the example at once, making it difficult to see which part caused a different result.
- Choosing a tag only because its default appearance looks right, without checking whether it describes the content correctly.
Key Takeaways
- A scripted keyboard trap may prevent Tab and Shift+Tab from reaching the rest of the page. Native controls and dialog focus behavior are safer starting points.
- Before the fix, the browser can behave incorrectly or report a warning. After the change, test the exact failure rather than assuming the page is fixed.
- Test the markup in a browser, and check accessibility and real-world behavior where relevant.