WordPress Admin Warnings in the Block Editor

We sent out an email the other week that ultimately had a

You actually can send

So instead, to prevent us from doing it again, I used (drumroll)…. CSS.

I have some CSS that gets loaded in the admin area only when the block editor is loaded, which is in a functionality plugin:

wp_register_style(
  'css-tricks-code-block-editor-css',
  plugins_url('location/of/styles.css', dirname( __FILE__ )),
  array('wp-edit-blocks'),
  filemtime( plugin_dir_path(__DIR__) . 'location/of/styles.css')
);

I can put anything I want in that CSS file and it will effect styles of the block editor but nothing on the public front end of the site.

I also wanted to scope this CSS only to the newsletters page. Fortunately, WordPress has body classes in the editor as well. We have a Custom Post Type for newsletters, and that expresses itself as a class here:

So I chuck these styles in:

/* Warn about videos in newsletters */
.post-type-newsletters .wp-block-video {
  border: 5px solid red;
}
.post-type-newsletters .wp-block-video::before {
  content: "WARNING: NO VIDEOS IN EMAILS";
  display: block;
  color: red;
}

And boom, I have styles that warn about this problem before it happens again:

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