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Edit File: generated-classname.php

<?php /** * Generated classname block support flag. * * @package WordPress * @since 5.6.0 */ /** * Gets the generated classname from a given block name. * * @since 5.6.0 * * @access private * * @param string $block_name Block Name. * @return string Generated classname. */ function wp_get_block_default_classname( $block_name ) { // Generated HTML classes for blocks follow the `wp-block-{name}` nomenclature. // Blocks provided by WordPress drop the prefixes 'core/' or 'core-' (historically used in 'core-embed/'). $classname = 'wp-block-' . preg_replace( '/^core-/', '', str_replace( '/', '-', $block_name ) ); /** * Filters the default block className for server rendered blocks. * * @since 5.6.0 * * @param string $class_name The current applied classname. * @param string $block_name The block name. */ $classname = apply_filters( 'block_default_classname', $classname, $block_name ); return $classname; } /** * Adds the generated classnames to the output. * * @since 5.6.0 * * @access private * * @param WP_Block_Type $block_type Block Type. * @return array Block CSS classes and inline styles. */ function wp_apply_generated_classname_support( $block_type ) { $attributes = array(); $has_generated_classname_support = block_has_support( $block_type, 'className', true ); if ( $has_generated_classname_support ) { $block_classname = wp_get_block_default_classname( $block_type->name ); if ( $block_classname ) { $attributes['class'] = $block_classname; } } return $attributes; } // Register the block support. WP_Block_Supports::get_instance()->register( 'generated-classname', array( 'apply' => 'wp_apply_generated_classname_support', ) );