Does that mean that every page preview will generate a temporary page?

It would be great to avoid DB writes if we can.

The idea was to just be hooking into the rendering of an in-memory WP_Post object that is never persisted to the database.

The template would probably be something like this:

Thanks, @bgrgicak! The example helped me remember wp_head() and wp_footer().

It looks like something like this should work well enough without requiring use of templates:

add_action( 'init', 'playground_demo_block_init' );

function playground_demo_render_full_page() {
	wp_head();
        // NOTE: Actually block attrs should be taken from query params
	$block = array(
		'blockName' => 'wordpress-playground/playground',
		'attrs' => array(
			'align' => 'full',
			'codeEditor' => true,
			'constants' => 'eyJXUF9ERUJVRyI6dHJ1ZSwiV1BfU0NSSVBUX0RFQlVHIjp0cnVlfQ==',
			'files' => array (
				'W3siY29udGVudHMiOiIiLCJuYW1lIjoidGVzdC54eXoiLCJyZW1vdGVVcmwiOiIifSx7ImNvbnRlbnRzIjoiIiwibmFtZSI6ImluZGV4LmpzIiwicmVtb3RlVXJsIjoiIn1d'
			),
		),
		'innerBlocks' => array (),
		'innerHTML' => '',
		'innerContent' => array (),
	);
	echo render_block( $block );
	wp_footer();
	die();
}

if ( isset( $_GET['playground_full_page'] ) ) {
	add_action( 'init', 'playground_demo_render_full_page', 9999 );
}

Playground Block: Add a link to launch a full instance #279

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