private function modify_dom_images( $dom ) {

		$images    = $dom->getElementsByTagName( 'img' );
		$to_remove = array();

		// Convert images to data uris.
		foreach ( $images as $img ) {

			$img_data_type = $this->get_image_data_and_type( $img->getAttribute( 'src' ) );

			if ( empty( $img_data_type['data'] ) || empty( $img_data_type['type'] ) ) {
				$to_remove[] = $img; // Save images to remove: removing them directly here will alter the collection iteration (skip).
				continue;
			}

			$data = base64_encode( $img_data_type['data'] );// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_encode

			$img->setAttribute( 'src', 'data:' . $img_data_type['type'] . ';base64,' . $data );

			// Remove srcset and sizes attributes.
			$img->removeAttribute( 'sizes' );
			$img->removeAttribute( 'srcset' );
			// Remove useless loading attribute.
			$img->removeAttribute( 'loading' );
		}

		foreach ( $to_remove as $img ) {
			$img->parentNode->removeChild( $img ); // phpcs:ignore WordPress.NamingConventions.ValidVariableName.UsedPropertyNotSnakeCase
		}

	}