If you run a markup validation check, such as the W3C tool or FreeFormMatter validator, you might encounter errors that pertain to the markup that NitroPack added during the optimization process.

Here’s an example of generated validation report:

Primarily, the issue lies in the fact that these attributes are not official ones. The same is used by our service to allow the execution of our optimization process and further change its default behavior when needed.

These attributes do not affect your website’s accessibility or SEO, nor do they negatively impact your performance.

Please note that these custom attributes allow our service to operate in its current manner and cannot be disabled.

📌 If you need any assistance or have questions, you can always reach out to our support team at [email protected] or via this link: https://support.nitropack.io