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

20function block_core_details_set_img_fetchpriority_low( $block_content, array $block ): string {21	if ( ! is_string( $block_content ) ) {22		return '';23	}24 25	// If the Details block is open by default, short-circuit to let core add fetchpriority=high if appropriate.26	if ( $block['attrs']['showContent'] ?? false ) {27		return $block_content;28	}29 30	$tags = new WP_HTML_Tag_Processor( $block_content );31	while ( $tags->next_tag( 'IMG' ) ) {32		$tags->set_attribute( 'fetchpriority', 'low' );33	}34	return $tags->get_updated_html();35}