wp_render_typography_support( string $block_content, array $block ): string

308function wp_render_typography_support( $block_content, $block ) {309	if ( ! empty( $block['attrs']['fitText'] ) && $block['attrs']['fitText'] && ! is_admin() ) {310		wp_enqueue_script_module( '@wordpress/block-editor/utils/fit-text-frontend' );311 312		// Add Interactivity API directives for fit text to work with client-side navigation.313		if ( ! empty( $block_content ) ) {314			$processor = new WP_HTML_Tag_Processor( $block_content );315			if ( $processor->next_tag() ) {316				if ( ! $processor->get_attribute( 'data-wp-interactive' ) ) {317					$processor->set_attribute( 'data-wp-interactive', true );318				}319				$processor->set_attribute( 'data-wp-context---core-fit-text', 'core/fit-text::{"fontSize":""}' );320				$processor->set_attribute( 'data-wp-init---core-fit-text', 'core/fit-text::callbacks.init' );321				$processor->set_attribute( 'data-wp-style--font-size', 'core/fit-text::context.fontSize' );322				$block_content = $processor->get_updated_html();323			}324		}325		// fitText supersedes any other typography features326		return $block_content;327	}328	if ( ! isset( $block['attrs']['style']['typography']['fontSize'] ) ) {329		return $block_content;330	}331 332	$custom_font_size = $block['attrs']['style']['typography']['fontSize'];333	$fluid_font_size  = wp_get_typography_font_size_value( array( 'size' => $custom_font_size ) );334 335	/*336	 * Checks that $fluid_font_size does not match $custom_font_size,337	 * which means it's been mutated by the fluid font size functions.338	 */339	if ( ! empty( $fluid_font_size ) && $fluid_font_size !== $custom_font_size ) {340		// Replaces the first instance of `font-size:$custom_font_size` with `font-size:$fluid_font_size`.341		return preg_replace( '/font-size\s*:\s*' . preg_quote( $custom_font_size, '/' ) . '\s*;?/', 'font-size:' . esc_attr( $fluid_font_size ) . ';', $block_content, 1 );342	}343 344	return $block_content;345}