Use the ACE HTML Block to get some assistance when writing HTML.

Screenshot

Example

Ace HTML block

It’s a block that syntax highlights HTML as you type it.

Bad HTML – no end tag

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Notes

• The ACE HTML Block plugin appears to use the same editor that Gutenberg tried to use for Custom HTML – core/html.
• If you write invalid HTML then the block may display `This block contains unexpected or invalid conent.` on the next edit. Choose More Options Attempt Block Recovery.
• Transforms to Group – core/group, Custom HTML – core/html, Shortcode – core/shortcode.
• It may lose the content during the transformation.
• A Custom HTML block can be transformed to an ACE HTML block.