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HTML Details/Summary Generator

Configure a native HTML accordion — summary toggle text, hidden content, and open state — then copy the ready-to-paste `<details>` element.

Last updated: May 21, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is HTML Details/Summary Generator?

The HTML `<details>` element creates a native browser disclosure widget — a collapsible section that the user can open and close without JavaScript. The `<summary>` child provides the visible toggle text (the "show/hide" button). All other content inside `<details>` is hidden by default and shown when the user clicks the summary.

The `open` attribute makes the details expanded by default. The element dispatches a `toggle` event you can listen to with JavaScript if needed.

How to Use HTML Details/Summary Generator

1

Enter the summary text (the visible toggle label)

2

Enter the content that appears when expanded

3

Toggle "open by default" if the details should start expanded

4

Add id or class attributes if needed

5

Copy the generated HTML

Common Use Cases

  • FAQ pages where each question expands to show the answer.
  • Product pages with expandable specification or description sections.
  • Forms with optional advanced settings in a collapsible panel.
  • Developers who want a no-JavaScript accordion that works in all modern browsers.

Example Input and Output

A simple FAQ entry using details/summary.

Configuration
Summary: What is HTML?
Content: HTML is the standard markup language for creating web pages.
HTML output
<details>
  <summary>What is HTML?</summary>
  <p>HTML is the standard markup language for creating web pages.</p>
</details>

Privacy

All HTML generation runs in your browser. No data is sent to any server.

Frequently Asked Questions

Do I need JavaScript to use <details>?

No. The <details> element is a native browser disclosure widget — toggling open/closed works without any JavaScript. All modern browsers support it. You can optionally listen to the toggle event with JavaScript if you need to respond to open/close actions.

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