URL: /rules/a11y/duplicate-id-active

---
title: "Duplicate ID Active"
description: "Checks that active, focusable elements have unique IDs"
---

Checks that active, focusable elements have unique IDs

| | |
|---|---|
| **Rule ID** | `a11y/duplicate-id-active` |
| **Category** | [Accessibility](/rules/a11y) |
| **Scope** | Per-page |
| **Severity** | error |
| **Weight** | 7/10 |

## Solution

Duplicate IDs on focusable elements (links, buttons, inputs) break keyboard navigation and label associations. Browsers only recognize the first element with a given ID, so labels, focus management, and ARIA references will target the wrong element. Ensure every focusable element with an id attribute has a unique value.

## Enable / Disable

### Disable this rule

```toml squirrel.toml
[rules]
disable = ["a11y/duplicate-id-active"]
```

### Disable all Accessibility rules

```toml squirrel.toml
[rules]
disable = ["a11y/*"]
```

### Enable only this rule

```toml squirrel.toml
[rules]
enable = ["a11y/duplicate-id-active"]
disable = ["*"]
```