The system allows you to check the HTML validity of page code. Validation is always performed against the version of HTML declared in the validated code.
To validate a page's HTML:
Warning: During validation, your data is sent to an external 3rd party validation service. If you have sensitive, non‑public content, we recommend using other types of validation.
If the validator finds issues in the page's HTML code, the page displays a list. You can see the following information for each issue:
Note: If you navigate to another page in preview mode using links on the displayed pages, and then switch to the Validate tab, the system still validates the page selected in the content tree.