The default handlers available are:
- url: Allows generating escaped and routed URLs using Router::match(). Note that
all falsey values, which includes an empty array, will result in '/' being
returned. For empty arrays this behavior is slightly different from using
Router::match() directly.
- path: Generates an asset path.
- options: Converts a set of parameters to HTML attributes into a string.
- title: Returns the escaped title.
- value: Returns an escaped value.
- scripts: Returns a markup string of styles from context.
- styles: Returns a markup string of scripts from context.
- head