# Changing encoding at this point would need non-streamable behavior.
> Canonical HTML version: https://rocketvalidator.com/html-validation/changing-encoding-at-this-point-would-need-non-streamable-behavior
> Attribution: Rocket Validator (https://rocketvalidator.com)
> License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)
Changing the character encoding declaration too late in the document prevents the browser from processing it correctly. The `` declaration must appear within the first 1024 bytes of the HTML document, and specifically before any non-ASCII content.
When a browser parses an HTML document, it reads the bytes as a stream. If it encounters a `` tag after it has already started interpreting content, it would need to go back and re-parse everything from the beginning — this is "non-streamable behavior." To avoid this, the HTML specification requires that the charset declaration appear very early in the document.
The most common causes of this error are:
- Placing `` after other large `` tags, long `` content, or `<script>` blocks in the `<head>`.
- Placing `<meta charset>` after content that pushes it beyond the 1024-byte boundary.
- Including it in the `<body>` instead of the `<head>`.
The fix is simple: make `<meta charset="utf-8">` the **very first element** inside `<head>`, before any other elements.
## Incorrect Example
```html
<!DOCTYPE html>
<html lang="en">
<head>
<title>A very long title that takes up many bytes and pushes the charset declaration further down in the document stream...
Hello world