WordPress Block Markup Syntax

When to Use

Use this skill when:

• Writing raw block markup for patterns, templates, or REST API content pushes
• Debugging block validation errors ("Block contains unexpected content")
• Converting HTML to block format programmatically
• Working with block templates in PHP
• Understanding how blocks serialize to post_content

Block Grammar

WordPress blocks use HTML comments as delimiters. The content between comments is valid HTML that the parser reconstructs on load.

Three Block Forms