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

Summary text (visible toggle)

Content text (hidden by default)

Class

Open by default

Generated HTML

<details>
  <summary>Click to expand</summary>
  <p>This is the hidden content that appears when the details element is open.</p>
</details>

Preview

Click to expand

This is the hidden content that appears when the details element is open.

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

Enter the summary text (the visible toggle label)

Enter the content that appears when expanded

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

Add id or class attributes if needed

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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