wp_kses_allowed_html( string|array $context = '' ): array

849function wp_kses_allowed_html( $context = '' ) {850	global $allowedposttags, $allowedtags, $allowedentitynames;851 852	if ( is_array( $context ) ) {853		// When `$context` is an array it's actually an array of allowed HTML elements and attributes.854		$html    = $context;855		$context = 'explicit';856 857		/**858		 * Filters the HTML tags that are allowed for a given context.859		 *860		 * HTML tags and attribute names are case-insensitive in HTML but must be861		 * added to the KSES allow list in lowercase. An item added to the allow list862		 * in upper or mixed case will not recognized as permitted by KSES.863		 *864		 * @since 3.5.0865		 *866		 * @param array[] $html    Allowed HTML tags.867		 * @param string  $context Context name.868		 */869		return apply_filters( 'wp_kses_allowed_html', $html, $context );870	}871 872	switch ( $context ) {873		case 'post':874			/** This filter is documented in wp-includes/kses.php */875			$tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );876 877			// 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`.878			if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) {879				$tags = $allowedposttags;880 881				$tags['form'] = array(882					'action'         => true,883					'accept'         => true,884					'accept-charset' => true,885					'enctype'        => true,886					'method'         => true,887					'name'           => true,888					'target'         => true,889				);890 891				/** This filter is documented in wp-includes/kses.php */892				$tags = apply_filters( 'wp_kses_allowed_html', $tags, $context );893			}894 895			return $tags;896 897		case 'user_description':898		case 'pre_user_description':899			$tags             = $allowedtags;900			$tags['a']['rel'] = true;901			/** This filter is documented in wp-includes/kses.php */902			return apply_filters( 'wp_kses_allowed_html', $tags, $context );903 904		case 'strip':905			/** This filter is documented in wp-includes/kses.php */906			return apply_filters( 'wp_kses_allowed_html', array(), $context );907 908		case 'entities':909			/** This filter is documented in wp-includes/kses.php */910			return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context );911 912		case 'data':913		default:914			/** This filter is documented in wp-includes/kses.php */915			return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context );916	}917}