public StatusMessages::getInfo()

Provides a render element for displaying the label for a form element. Labels are generated automatically from element properties during processing

Event fired when rendering main content, to select a page display variant. Subscribers of this event can call the following setters to pass

public ElementInfoManager::__construct(\Traversable $namespaces

hook_page_attachments(array &$attachments) Add attachments (typically assets) to a page before it is rendered

Defines an interface for turning a render array into a placeholder. This encapsulates logic related to generating placeholders.

Implements MarkupInterface and Countable for rendered objects. Hierarchy trait \D

Provides a form element for input of multiple-line text. Properties: #rows: Number of

A response that contains and can expose cacheability metadata and attachments. Supports Drupal's caching concepts: cache tags for invalidation

public PlaceholderStrategyInter