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<?php

/**
 * Allow editors to insert iframe and svg tags
 */
function filter_map_meta_cap( $caps, $cap, $user_id ) {
  if ( 'unfiltered_html' === $cap && user_can( $user_id, 'editor' ) ) {
    $caps = array( 'unfiltered_html' );
  }
  return $caps;
}
add_filter( 'map_meta_cap', 'filter_map_meta_cap', 1, 3 );