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Wrap Custom HTML WordPress blocks in a div wrapper
add_filter( 'render_block', 'custom_wrap_html_block_output', 10, 2 );
* Wrap output of HTML blocks.
* @param string $block_content Original block content.
* @param array $block Block info.
* @return string The block content with a wrapper.
function custom_wrap_html_block_output( $block_content, $block ) {
if ( 'core/html' === $block['blockName'] ) {
$block_content = '<div class="test">' . $block_content . '</div>';
return $block_content;
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