hook_page_top(array &$page_top) Add a renderable array to the top of the page.

public static Radio::preRenderRadio($element) Prepares

Defines a form element plugin annotation object. See

protected ElementInfoManager::getCid($theme_name)

Provides a form element for a drop-down menu or scrolling selection box. Properties: #options:

public Pager::getInfo() Returns the element

The renderer service. Type:

public PlaceholderGenerator::createPlaceholder(array $element)

Name of the event when selecting a page display variant to use. This event allows you to select a different page display variant to use when

public static RenderElement::preRenderAjaxForm($element)