Common UI bugs include controls that cannot be used with a keyboard, forms that fail without explaining why, and status cues that rely on color alone. Find them by trying a real task with different input methods, submitting invalid data, and checking whether labels, feedback, and layouts remain clear. These are useful accessibility-focused examples—not a complete inventory or a ranking of how often interface bugs occur.
What are common UI bugs?
A UI bug is a flaw in how an interface presents information or responds to a person’s actions. It may block a task outright, make the next step unclear, or make a control difficult for some people to identify or operate. The examples below focus on accessibility-related failures documented in guidance from the World Wide Web Consortium (W3C), the U.S. Department of Justice, and WebAIM. They do not cover every visual, functional, compatibility, or performance defect.
| Bug pattern | What someone may experience | How to check |
|---|---|---|
| Mouse-only control | A menu, button, or other function cannot be reached or activated without a mouse. | Try to reach and operate every meaningful control using only a keyboard. |
| Focus or navigation failure | Keyboard focus skips a control, moves in a confusing order, or becomes trapped. | Use Tab and Shift+Tab to traverse controls and check that each component can be exited. |
| Missing or vague form error | A form fails to submit but does not say what needs fixing, or shows only a generic notice. | Submit missing or invalid values and check whether the affected field and problem are identified in text. |
| Color-only status | A required, invalid, or successful state is indicated only by a color change. | Check whether the status remains understandable without relying on color and what assistive technology can announce. |
| Low contrast | Text or important controls are difficult to distinguish from their background. | Inspect foreground and background contrast, including important text and controls. |
| Missing or unclear form label | The purpose of an input is unclear, or its visible label is not associated with it. | Check each input’s visible label and verify that it is associated with the control. |
| Weak interaction feedback | Controls are hard to identify, navigation changes position or naming inconsistently, or an action gives no clear result. | Compare navigation across pages and check whether controls and action results are identifiable. |
| Narrow-layout or enlarged-text failure | Content or navigation becomes unavailable or difficult to use in a narrow window or with larger text. | Review a narrow viewport and enlarge text to see whether content and controls remain usable. |
How do I find UI bugs?
Inspect the interface by carrying out a real task, not just by looking at a static page. A useful manual review follows the task through its controls, input methods, error states, and display conditions.
- Choose a task. For example, find an item, fill in a form, change a setting, or open a menu. Note the point where the interface stops responding or communicating clearly.
- Repeat it with a keyboard. Use Tab and Shift+Tab to move among links, buttons, and input fields. Activate controls using their standard keyboard behavior. Check that focus order makes sense and that you can leave each component. If the product supports mobile use, also check it with an external keyboard where practical.
- Exercise form errors. Submit an empty form or deliberately enter an invalid value. Check that the affected field is identified and the problem is explained in text. A browser’s built-in validation may provide a generic message; W3C notes that behavior can vary, and some browser and screen-reader combinations may expose only the first error.
- Check meaning and visibility. Review labels, contrast, non-color cues, identifiable interactive elements, and feedback after actions. Ask whether someone can understand the state or result without depending on color alone.
- Vary the display. Review a narrow viewport and enlarged text. Look for content, navigation, or controls that become difficult to reach or understand.
- Record reproducible findings. Note the task, input method, starting state, steps, expected behavior, actual behavior, and affected control. Those details help another person reproduce the issue.
What should the expected behavior be?
Keyboard operation
WCAG 2.2 says functionality must be operable through a keyboard interface, with a stated exception for functions whose underlying operation depends on the path of movement rather than just its endpoints. In practice, a keyboard review should verify both that controls can be operated and that focus can move away from them. DOJ guidance also identifies mouse-only navigation as an accessibility barrier.
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Useful form errors
Under WCAG 2.2’s error-identification criterion, an automatically detected input error must identify the item in error and describe the problem in text. Merely redisplaying a failed form without indicating that submission failed does not provide that information. Check the actual message, not just whether the form prevents submission.
Information that does not depend on color alone
Color can reinforce a state, but should not be its only signal. A red border alone, for example, may not explain which field needs attention or what is wrong. Check for a textual message or another identifiable cue, and consider whether the status is available to screen-reader users.
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Labels, contrast, and feedback
W3C design guidance highlights associated form labels, sufficient contrast, identifiable interactive elements, feedback, and clear, consistent navigation as practical review areas. Check whether the control’s purpose is apparent and whether the result of an action is communicated.
Different viewports and text sizes
W3C recommends designing for different viewport sizes. A layout that works at one desktop width may make information or controls difficult to use on a narrow screen or when text is enlarged. Review those conditions rather than assuming that a page’s default desktop appearance is enough.
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How to report a UI bug clearly
A concise report should let someone else repeat the failure without guessing. Include:
- The page or screen and the task being attempted.
- The starting state and input method, such as keyboard-only or touch.
- Numbered steps, including the values entered if a form is involved.
- What you expected to happen and what actually happened.
- The affected control and, when useful, the viewport or text-size condition.
Describe the observed behavior rather than only labeling it “broken.” For example: “With the keyboard, pressing Tab moves from the email field to the footer; the Submit button is skipped.”
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What this review can—and cannot—establish
WCAG 2.2 is the normative accessibility reference for the requirements described here. A manual walkthrough is a starting point, not proof of conformance: it cannot establish that every requirement is met, uncover every UI defect, or replace testing with people who use assistive technologies.
The U.S. Department of Justice’s ADA guidance gives examples of website accessibility barriers and discusses standards used by the federal government. That is not a universal legal conclusion for every website or jurisdiction. W3C’s WCAG 3.0 page, dated September 10, 2026, describes a working draft; it is draft material, not the current conformance standard.
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Frequently Asked Questions
Does finding one accessibility issue mean an interface is unusable?
No. It identifies a specific barrier or weakness to investigate; its impact depends on the task and the people affected.
Can a screenshot prove that a UI works correctly?
No. It records appearance at a point in time, but cannot establish that controls operate correctly or that a task is accessible.
Is WCAG 3.0 the current conformance standard?
No. The W3C page surfaced for this article identifies WCAG 3.0 as a working draft; WCAG 2.2 is the normative reference used here.
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