Source

File: wp-includes/media.php

function wp_lazy_loading_enabled( $tag_name, $context ) {
	// By default add to all 'img' tags.
	// See https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-loading
	$default = ( 'img' === $tag_name );

	/**
	 * Filters whether to add the `loading` attribute to the specified tag in the specified context.
	 *
	 * @since 5.5.0
	 *
	 * @param bool   $default  Default value.
	 * @param string $tag_name The tag name.
	 * @param string $context  Additional context, like the current filter name or the function name from where this was called.
	 */
	return (bool) apply_filters( 'wp_lazy_loading_enabled', $default, $tag_name, $context );
}