public Hidden::getInfo() Returns the

public static Email::validateEmail(&$element, FormStateInterface $form_state

Provides an interface for form element plugins. Form element plugins are a subset of render elements, specifically representing HTML elements

Provides a form element for an HTML 'hidden' input element. Specify either #default_value or #value but not both.

Provides a render element for a set of operations links. This is a special case of

public Range::getInfo() Returns the element

public static File::processFile(&$element, FormStateInterface $form_state,

public static Tableselect::preRenderTableselect($element)

public static MachineName::processMachineName(&$element, FormStateInterface

Provides an action button form element. When the button is pressed, the form will be submitted to Drupal, where it is validated and rebuilt