# NotAllowedError: Failed to execute 'writeText' on 'Clipboard': Document is not focused.

**Code:** `clipboard write blocked` · **Category:** JavaScript · **Seen on:** JavaScript

The Clipboard API refused to write — the page isn’t focused, there was no user gesture, or the context isn’t secure.

## Meaning

navigator.clipboard requires HTTPS (or localhost), a focused document and usually a user gesture. It’s undefined on plain HTTP.

## Common causes

- Page served over HTTP (navigator.clipboard undefined)
- Called without a click
- DevTools focused instead of the page
- Iframe without clipboard-write permission

## Quick fix

1. Serve over HTTPS
2. Call from a click handler
3. Add allow="clipboard-write" on iframes
4. Fall back to document.execCommand('copy')

## Detailed fix by platform

### JavaScript

1. `button.addEventListener('click', () => navigator.clipboard.writeText(text));`

## How to diagnose

1. **Context** — HTTPS?
2. **Gesture** — Triggered by a click?

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Source: [WhatIsMyError](https://whatismyerror.com/errors/javascript/notallowederror-clipboard)