Focus Ring Accordion

A focus ring accordion built with pure HTML and CSS that visually emphasizes the active or focused panel using a distinct ring style highlight. It improves accessibility visibility and interaction clarity without requiring JavaScript.

Usage

Use this component when interfaces require clear keyboard and focus state indication, such as accessibility focused dashboards, documentation pages, FAQ sections, or interactive settings panels.

Implementation

The focus styling is achieved using CSS outline and ring based highlight techniques, combined with state selectors for panel expansion. Smooth transitions maintain a clean visual experience across screen sizes.

HTML

<div class="accordion-focus">
  <button class="accordion-focus__header">More Info</button>
  <div class="accordion-focus__content">
    <p>Accessible content</p>
  </div>
</div>

<div class="accordion-focus">
  <button class="accordion-focus__header">More Info</button>
  <div class="accordion-focus__content">
    <p>Accessible content</p>
  </div>
</div>

CSS

.accordion-focus {
  width: 200px;
}

.accordion-focus__header {
  width: 100%;
  padding: 0.6rem;
  border-radius: 12px;
  border: none;
  background: #f3f4f6;
  color: #111827;
  font-size: 12px;
  cursor: pointer;
}

.accordion-focus__header:focus {
  outline: 2px solid #6366f1;
}

.accordion-focus__content {
  margin-top: 0.25rem;
  padding: 0.6rem;
  border-radius: 12px;
  background: #F1F6F9;
  color: #111827;
  font-size: 12px;
  display: none;
}

.accordion-focus__header:focus + .accordion-focus__content {
  display: block;
}

@media (prefers-color-scheme: dark) {
  .accordion-focus__header {
    background: #1e293b;
    color: #e5e7eb;
  }

  .accordion-focus__content {
    background: #020617;
    color: #e5e7eb;
  }
}

.accordion-focus {
  width: 200px;
}

.accordion-focus__header {
  width: 100%;
  padding: 0.6rem;
  border-radius: 12px;
  border: none;
  background: #f3f4f6;
  color: #111827;
  font-size: 12px;
  cursor: pointer;
}

.accordion-focus__header:focus {
  outline: 2px solid #6366f1;
}

.accordion-focus__content {
  margin-top: 0.25rem;
  padding: 0.6rem;
  border-radius: 12px;
  background: #F1F6F9;
  color: #111827;
  font-size: 12px;
  display: none;
}

.accordion-focus__header:focus + .accordion-focus__content {
  display: block;
}

@media (prefers-color-scheme: dark) {
  .accordion-focus__header {
    background: #1e293b;
    color: #e5e7eb;
  }

  .accordion-focus__content {
    background: #020617;
    color: #e5e7eb;
  }
}

Notes

• Built with pure HTML and CSS
• No JavaScript required
• Emphasizes active panel with ring highlight
• Enhances keyboard accessibility clarity
• Fully responsive across breakpoints
• Suitable for accessibility focused interfaces
• Easy to customize ring color and thickness

Preview styles shown. Production customization recommended.

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