Gutenberg Embed
This post was written using the Gutenberg editor in WordPress 5.0. I used the editor to embed to embed this YouTube video. Below is the markup that is generated by the editor.
<!-- wp:core-embed/youtube {"url":"https://youtu.be/NLBLVu3SrlI","type":"video","providerNameSlug":"youtube","className":"wp-embed-aspect-16-9 wp-has-aspect-ratio"} --><figure class="wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio"><div class="wp-block-embed__wrapper">https://youtu.be/NLBLVu3SrlI</div></figure><!-- /wp:core-embed/youtube -->
