add-taxonomy-class-to-body-element.php

/**
 * Add Page Terms (Taxonomy) to Body Tag
 */
function pro_page_taxonomy_class_to_body( $classes ){
	if ( $pageTaxonomy = get_the_terms( get_the_ID(), 'my_taxonomy_slug' ) ) {
		foreach( $taxonomyTerm as $term ){
			if(is_array($term)){
				if(!empty($term['slug'])){
					$termClass = 'mytaxonomy-' . $term['slug'];
					array_push( $classes,  $termClass );
				}
			}else{
				$termClass = 'mytaxonomy-' . $term->slug;
				array_push( $classes,  $termClass );
			}
		}	
	}
	return $classes;
}
add_filter( 'body_class', 'pro_page_taxonomy_class_to_body' );