Form elements can have their own validators. The form state will aggregate all of the element validation methods and pass them to the form validation service. This will run with the form's validation.

There is a limit_validation_errors option, which can be set to allow selected invalid errors to be passed. This option allows you to bypass validation on specific elements in your form. This is useful if a form has two submit buttons and each intends to validate and submit specific data. This attribute is defined in the submit button, also known as the triggering element in the form state. It is an array value consisting of form element keys.