# HTML Validator Upgraded to W3C Validator 23.3

> Canonical HTML version: https://rocketvalidator.com/blog/html-validator-upgraded-to-w3c-validator-23-3
> Attribution: Rocket Validator (https://rocketvalidator.com)
> License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

We've upgraded our HTML Validator servers to use the latest version of the W3C Validator Nu.

We've upgraded our HTML Validation servers to use the latest version of the [W3C Validator Nu](https://github.com/validator/validator/), 23.3.

This new version includes [several updates](https://github.com/validator/validator/blob/main/CHANGELOG.md) in HTML checks, like:

* Report void elements that have a trailing slash in their start tags
* Skip template contents when checking for duplicate IDs (bug fix)
* Allow `loading` attribute for the iframe element (lazy loading)
* Allow `autocomplete=username` with `input[type=email]`
* Allow `operator=lighter` for SVG `feComposite` element
* Allow more values for SVG `feBlend` element mode attribute
* Allow non-JS MIME types for `script` elements with `src` attributes
* CSS: Support `color-adjust`
* ARIA: Added many changes to align with current ARIA in HTML and ARIA specs
* Make the checker use HTTP 1.0 for all requests it sends, not HTTP 1.1
* Make the checker ignore error for malformed/missing HTTP closing chunk

This upgrade is available for all users, your reports will automatically pick up the latest version on the next run.