How the WordPress Block Based Editor Stores Blocks

All of the following examples are part of the content stored in the post_content column of the database.

A Static Block

A Paragraph Block

<!-- wp:paragraph -->
<p>This is a paragraph block.</p>
<!-- /wp:paragraph -->

A Quote Block

<!-- wp:quote -->
<blockquote class="wp-block-quote">
  <p>I was only ever wrong once
  and that was the time I
  thought I was wrong.</p>
  <cite>My Grandfather</cite></blockquote>
<!-- /wp:quote -->

A Dynamic Block

<!-- wp:my-plugin/my-block -->
<p class="wp-block-my-plugin-my-block">
  Hello from the saved content!</p>
<!-- /wp:my-plugin/my-block -->

A Dynamic Block

Dynamic block – no stored attributes

The following block would either have no attributes (or the attributes are stored in post meta).

<!-- wp:my-plugin/my-block /-->

Dynamic block with attribute called “val”

<!-- wp:my-plugin/my-block {"val":"Now I have editable content. I editted this."} /-->