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

454function twenty_twenty_one_get_attachment_image_attributes( $attr, $attachment, $size ) {455 456	if ( is_admin() ) {457		return $attr;458	}459 460	if ( isset( $attr['class'] ) && false !== strpos( $attr['class'], 'custom-logo' ) ) {461		return $attr;462	}463 464	$width  = false;465	$height = false;466 467	if ( is_array( $size ) ) {468		$width  = (int) $size[0];469		$height = (int) $size[1];470	} elseif ( $attachment && is_object( $attachment ) && $attachment->ID ) {471		$meta = wp_get_attachment_metadata( $attachment->ID );472		if ( isset( $meta['width'] ) && isset( $meta['height'] ) ) {473			$width  = (int) $meta['width'];474			$height = (int) $meta['height'];475		}476	}477 478	if ( $width && $height ) {479 480		// Add style.481		$attr['style'] = isset( $attr['style'] ) ? $attr['style'] : '';482		$attr['style'] = 'width:100%;height:' . round( 100 * $height / $width, 2 ) . '%;max-width:' . $width . 'px;' . $attr['style'];483	}484 485	return $attr;486}