register_block_style()

register_block_style() — Registers a new block style.

Inputs: $block_name (string|string[]): Block type name including namespace or array of namespaced block type names. $style_properties (array): Array containing the properties of the style name, label, style_handle (name of the stylesheet to be enqueued), inline_style (string containing the CSS to be added), style_data (theme.json-like array to generate CSS from). See WP_Block_Styles_Registry::register().

Returns bool: True if the block style was registered with success and false otherwise.