WP_Widget_Media_Image::render_media( array $instance )

177	public function render_media( $instance ) {178		$instance = array_merge( wp_list_pluck( $this->get_instance_schema(), 'default' ), $instance );179		$instance = wp_parse_args(180			$instance,181			array(182				'size' => 'thumbnail',183			)184		);185 186		$attachment = null;187 188		if ( $this->is_attachment_with_mime_type( $instance['attachment_id'], $this->widget_options['mime_type'] ) ) {189			$attachment = get_post( $instance['attachment_id'] );190		}191 192		if ( $attachment ) {193			$caption = '';194			if ( ! isset( $instance['caption'] ) ) {195				$caption = $attachment->post_excerpt;196			} elseif ( trim( $instance['caption'] ) ) {197				$caption = $instance['caption'];198			}199 200			$image_attributes = array(201				'class' => sprintf( 'image wp-image-%d %s', $attachment->ID, $instance['image_classes'] ),202				'style' => 'max-width: 100%; height: auto;',203			);204			if ( ! empty( $instance['image_title'] ) ) {205				$image_attributes['title'] = $instance['image_title'];206			}207 208			if ( $instance['alt'] ) {209				$image_attributes['alt'] = $instance['alt'];210			}211 212			$size = $instance['size'];213 214			if ( 'custom' === $size || ! in_array( $size, array_merge( get_intermediate_image_sizes(), array( 'full' ) ), true ) ) {215				$size  = array( $instance['width'], $instance['height'] );216				$width = $instance['width'];217			} else {218				$caption_size = _wp_get_image_size_from_meta( $instance['size'], wp_get_attachment_metadata( $attachment->ID ) );219				$width        = empty( $caption_size[0] ) ? 0 : $caption_size[0];220			}221 222			$image_attributes['class'] .= sprintf( ' attachment-%1$s size-%1$s', is_array( $size ) ? implode( 'x', $size ) : $size );223 224			$image = wp_get_attachment_image( $attachment->ID, $size, false, $image_attributes );225 226		} else {227			if ( empty( $instance['url'] ) ) {228				return;229			}230 231			$instance['size'] = 'custom';232			$caption          = $instance['caption'];233			$width            = $instance['width'];234			$classes          = 'image ' . $instance['image_classes'];235			if ( 0 === $instance['width'] ) {236				$instance['width'] = '';237			}238			if ( 0 === $instance['height'] ) {239				$instance['height'] = '';240			}241 242			$attr = array(243				'class'  => $classes,244				'src'    => $instance['url'],245				'alt'    => $instance['alt'],246				'width'  => $instance['width'],247				'height' => $instance['height'],248			);249 250			$loading_optimization_attr = wp_get_loading_optimization_attributes(251				'img',252				$attr,253				'widget_media_image'254			);255 256			$attr = array_merge( $attr, $loading_optimization_attr );