Provides a form element for selecting a language. This does not render an actual form element, but always returns the value of the default language

Provides a form element for a submit button with an image. Plugin annotation

public static Element::setAttributes(array &$element, array $map)

public RendererInterface::hasRenderContext()

public static Textfield::preRenderTextfield($element)

Provides an interface for render element plugins. Render element plugins allow modules to declare their own Render API element types and specify

hook_page_attachments_alter(array &$attachments) Alter attachments (typically assets) to a page before

public static Element::children(array &$elements, $sort = FALSE)

public static RenderElement::preRenderGroup($element)

public static FormElement::processPattern(&$element, FormStateInterface