Generates the default wp-block-{name} CSS class for server-rendered blocks.

Source: wp-includes/block-supports/generated-classname.php
Since: 5.6.0

Support Key

supports.className — defaults to true.

Functions

wp_get_block_default_classname()

function wp_get_block_default_classname( string $block_name ): string

Since: 5.6.0
Access: private

Generates the class name wp-block-{name} from the block name. WordPress core blocks have their core/ or core- prefix stripped:

• core/paragraph → wp-block-paragraph
• core-embed/youtube → wp-block-embed-youtube
• my-plugin/my-block → wp-block-my-plugin-my-block

Hooks

wp_apply_generated_classname_support()

function wp_apply_generated_classname_support( WP_Block_Type $block_type ): array

Since: 5.6.0
Access: private

Note: This function only receives $block_type (no $block_attributes). Checks block_has_support( $block_type, 'className', true ).

Returns: Array with class set to the generated classname.

Registration

WP_Block_Supports::get_instance()->register(
    'generated-classname',
    array(
        'apply' => 'wp_apply_generated_classname_support',
    )
);

Note: No register_attribute callback — this support only has an apply callback.