twentysixteen_post_thumbnail_sizes_attr( string[] $attr, WP_Post $attachment, string|int[] $size ): string[]

601function twentysixteen_post_thumbnail_sizes_attr( $attr, $attachment, $size ) {602	if ( 'post-thumbnail' === $size ) {603		if ( is_active_sidebar( 'sidebar-1' ) ) {604			$attr['sizes'] = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 60vw, (max-width: 1362px) 62vw, 840px';605		} else {606			$attr['sizes'] = '(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 88vw, 1200px';607		}608	}609	return $attr;610}