Associate labels with form controls

Rule Details

Every form control must have a label that is programmatically associated with it to ensure it is accessible to all users. MDN's <label> reference (opens in new tab) and WCAG form guidance both treat this as a baseline requirement, not an enhancement.

Code Examples

Correct Implementation

<label for="email-address">Email Address</label>
<input type="email" id="email-address" name="email">
 
<!-- Or wrapping the input -->
<label>
  Email Address
  <input type="email" name="email">
</label>

Incorrect Implementation

<span>Email Address</span>
<input type="email" name="email">

Why It Matters

• Assistive Technology: Screen readers announce the label when the user focuses on the input.
• Usability: Clicking the label moves focus to the input, providing a larger hit area for users with motor impairments or those on mobile devices.
• Form Validation: Browsers and tools can better associate error messages with the correct fields.

Best Practices

✅ Use for and id: This is the most robust way to associate labels.

<label for="first-name">First Name</label>
<input type="text" id="first-name">

✅ Nested Labels: Alternatively, you can nest the input inside the label.

<label>
  Last Name
  <input type="text">
</label>

❌ Avoid Placeholder-only labels: Placeholders disappear when the user types and are not a substitute for labels.

<!-- Avoid this -->
<input type="text" placeholder="First Name">

✅ Use <fieldset> and <legend> for grouped controls: Radio buttons and related checkboxes need a programmatic group label, not just bold text above them.

<fieldset>
  <legend>Preferred contact method</legend>
 
  <label>
    <input type="radio" name="contact" value="email">
    Email
  </label>
 
  <label>
    <input type="radio" name="contact" value="phone">
    Phone
  </label>
</fieldset>

Exceptions

• Evaluate the rendered experience before treating a static-code smell as a blocker; interaction timing, browser behavior, and assistive technology output often determine severity.
• Not every secondary accessibility issue deserves equal weight; prioritize the issue that most directly blocks perception, operation, or understanding.
• Avoid adding redundant markup or ARIA solely to satisfy a rule when a simpler semantic implementation would eliminate the issue entirely.

Standards

• Align the implementation with W3C WAI: WCAG Overview and verify the rendered experience, not only the source code.
• Align the implementation with MDN: Accessibility and verify the rendered experience, not only the source code.

Verification

Automated Checks

• Inspect the browser accessibility tree or accessibility pane for the relevant element, role, or accessible name.
• Run an automated accessibility checker such as axe or Lighthouse where applicable.

Manual Checks

• Test the affected UI with keyboard-only navigation and confirm the rule holds in the rendered experience.
• Re-test one representative user flow with a screen reader if this rule affects a key interaction.
• Confirm every field still has a visible label after the user starts typing and after browser autofill runs.
• For radio groups and checkbox groups, confirm the shared question is announced before the individual control labels.