Convert the submitted value into a route name and parameter pair. File core/lib/Drupal/Core/Render/Element/PathElement

public static Checkbox::processCheckbox(&$element, FormStateInterface

Provides a form element for a set of radio buttons. Properties: #options: An associative

Provides a form submit button. Submit buttons are processed the same as regular buttons, except they trigger the form's submit handler.

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

public static Checkboxes::getCheckedCheckboxes(array $input)

public static Tableselect::preRenderTableselect($element)