カスタムブロックスタイルのサンプルプラグイン - 三鷹・吉祥寺 WordPress Meetup「オンラインゆるもく会 + LT」(2020/5/2)

l2d-sample-custom-block-styles.php

<?php
/**
 * Plugin Name: L2D Sample Custom Block Styles
 * Plugin URI: https://gist.github.com/lunaluna/580f577259cfbe9e7ee1c32438c3aa90
 * Description: Sample custom block style plugin for Mitaka - Kichijyoji WordPress Meetup 2020/05/02
 * Author: Hiroki Saiki
 * Author URI: https://lunalunadesign.net/
 * Version: 1.0.0
 * License: GPL2+
 * License URI: https://www.gnu.org/licenses/gpl-2.0.txt
 *
 */

function l2d_sample_custom_block_styles_assets() {
	register_block_style(
		'core/heading',
		array(
			'name'         => 'heading-reverse',
			'label'        => '反転色',
			'inline_style' => '.is-style-heading-reverse {
				color: #f5efe0 !important;
				padding: .5rem;
				background-color: #000;
			}',
		)
	);
}
add_action( 'init', 'l2d_sample_custom_block_styles_assets' );