wp-includes/style-engine/class-wp-style-engine.php:31The main class integrating all other WP_Style_Engine_* classes.
#[AllowDynamicProperties]final class WP_Style_Engine { /** * Style definitions that contain the instructions to parse/output valid Gutenberg styles from a block's attributes. * * For every style definition, the following properties are valid: * * - classnames => (array) an array of classnames to be returned for block styles. The key is a classname or pattern. * A value of `true` means the classname should be applied always. Otherwise, a valid CSS property (string) * to match the incoming value, e.g., "color" to match var:preset|color|somePresetSlug. * - css_vars => (array) an array of key value pairs used to generate CSS var values. * The key should be the CSS property name that matches the second element of the preset string value, * i.e., "color" in var:preset|color|somePresetSlug. The value is a CSS var pattern (e.g. `--wp--preset--color--$slug`), * whose `$slug` fragment will be replaced with the preset slug, which is the third element of the preset string value, * i.e., `somePresetSlug` in var:preset|color|somePresetSlug. * - property_keys => (array) array of keys whose values represent a valid CSS property, e.g., "margin" or "border". * - path => (array) a path that accesses the corresponding style value in the block style object. * - value_func => (string) the name of a function to generate a CSS definition array for a particular style object. The output of this function should be `array( "$property" => "$value", ... )`. * * @since 6.1.0 * @since 7.1.0 Added `background.gradient` property. * @var array */ const BLOCK_STYLE_DEFINITIONS_METADATA = array( 'background' => array( 'backgroundImage' => array( 'property_keys' => array( 'default' => 'background-image', ), 'value_func' => array( self::class, 'get_url_or_value_css_declaration' ), 'path' => array( 'background', 'backgroundImage' ), ), 'backgroundPosition' => array( 'property_keys' => array( 'default' => 'background-position', ), 'path' => array( 'background', 'backgroundPosition' ), ), 'backgroundRepeat' => array( 'property_keys' => array( 'default' => 'background-repeat', ), 'path' => array( 'background', 'backgroundRepeat' ), ), 'backgroundSize' => array( 'property_keys' => array( 'default' => 'background-size', ), 'path' => array( 'background', 'backgroundSize' ), ), 'backgroundAttachment' => array( 'property_keys' => array( 'default' => 'background-attachment', ), 'path' => array( 'background', 'backgroundAttachment' ), ), 'gradient' => array( 'property_keys' => array( 'default' => 'background-image', ), 'css_vars' => array( 'gradient' => '--wp--preset--gradient--$slug', ), 'path' => array( 'background', 'gradient' ), 'classnames' => array( 'has-background' => true, ), ), ), 'color' => array( 'text' => array( 'property_keys' => array( 'default' => 'color', ), 'path' => array( 'color', 'text' ), 'css_vars' => array( 'color' => '--wp--preset--color--$slug', ), 'classnames' => array( 'has-text-color' => true,Introduced in 6.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/style-engine/class-wp-style-engine.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.