,
				'suffix'    => null,
				'unique_id' => '' === $unique_id ? null : $unique_id,
			);
		}

		// Otherwise, remove the first two dashes for a potential suffix
		$suffix = (string) substr( $remaining, 2 );

		// Look for '---' in the suffix for a unique_id
		$unique_id_index = strpos( $suffix, '---' );

		if ( false !== $unique_id_index && '-' !== ( $suffix[ $unique_id_index + 3 ] ?? '' ) ) {
			$unique_id = (string) substr( $suffix, $unique_id_index + 3 );
			$suffix    = (string) substr( $suffix, 0, $unique_id_index );
			return array(
				'prefix'    => $prefix,
				'suffix'    => '' === $suffix ? null : $suffix,
				'unique_id' => '' === $unique_id ? null : $unique_id,
			);
		}

		return array(
			'prefix'    => $prefix,
			'suffix'    => '' === $suffix ? null : $suffix,
			'unique_id' => null,
		);
	}

	/**
	 * Parses and extracts the namespace and reference path from the given
	 * directive attribute value.
	 *
	 * If the value doesn't contain an explicit namespace, it returns the
	 * default one. If the value contains a JSON object instead of a reference
	 * path, the function tries to parse it and return the resulting array. If
	 * the value contains strings that represent booleans ("true" and "false"),
	 * numbers ("1" and "1.2") or "null", the function also transform them to
	 * regular booleans, numbers and `null`.
	 *
	 * Example:
	 *
	 *     extract_directive_value( 'actions.foo', 'myPlugin' )                      => array( 'myPlugin', 'actions.foo' )
	 *     extract_directive_value( 'otherPlugin::actions.foo', 'myPlugin' )         => array( 'otherPlugin', 'actions.foo' )
	 *     extract_directive_value( '{ "isOpen": false }', 'myPlugin' )              => array( 'myPlugin', array( 'isOpen' => false ) )
	 *     extract_directive_value( 'otherPlugin::{ "isOpen": false }', 'myPlugin' ) => array( 'otherPlugin', array( 'isOpen' => false ) )
	 *
	 * @since 6.5.0
	 *
	 * @param string|true $directive_value   The directive attribute value. It can be `true` when it's a boolean
	 *                                       attribute.
	 * @param string|null $default_namespace Optional. The default namespace if none is explicitly defined.
	 * @return array An array containing the namespace in the first item and the JSON, the reference path, or null on the
	 *               second item.
	 * @phpstan-return array{ 0: string|null, 1: mixed }
	 */
	private function extract_directive_value( $directive_value, $default_namespace = null ): array {
		if ( empty( $directive_value ) || is_bool( $directive_value ) ) {
			return array( $default_namespace, null );
		}

		// Replaces the value and namespace if there is a namespace in the value.
		if ( 1 === preg_match( '/^([\w\-_\/]+)::./', $directive_value ) ) {
			list($default_namespace, $directive_value) = explode( '::', $directive_value, 2 );
		}

		/*
		 * Tries to decode the value as a JSON object. If it fails and the value
		 * isn't `null`, it returns the value as it is. Otherwise, it returns the
		 * decoded JSON or null for the string `null`.
		 */
		$decoded_json = json_decode( $directive_value, true );
		if ( null !== $decoded_json || 'null' === $directive_value ) {
			$directive_value = $decoded_json;
		}

		return array( $default_namespace, $directive_value );
	}

	/**
	 * Parse the HTML element and get all the valid directives with the given prefix.
	 *
	 * @since 6.9.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p      The directives processor instance.
	 * @param string                                    $prefix The directive prefix to filter by.
	 * @return array An array of entries containing the directive namespace, value, suffix, and unique ID.
	 * @phpstan-return list<array{
	 *     namespace: string|null,
	 *     value: mixed,
	 *     suffix: string|null,
	 *     unique_id: string|null,
	 * }>
	 */
	private function get_directive_entries( WP_Interactivity_API_Directives_Processor $p, string $prefix ): array {
		$directive_attributes = $p->get_attribute_names_with_prefix( 'data-wp-' . $prefix );
		if ( null === $directive_attributes ) {
			return array();
		}

		$entries = array();
		foreach ( $directive_attributes as $attribute_name ) {
			$parsed_directive = $this->parse_directive_name( $attribute_name );
			if ( null === $parsed_directive ) {
				continue;
			}

			[ 'prefix' => $attr_prefix, 'suffix' => $suffix, 'unique_id' => $unique_id ] = $parsed_directive;
			// Ensure it is the desired directive.
			if ( $prefix !== $attr_prefix ) {
				continue;
			}
			$attribute_value = $p->get_attribute( $attribute_name );
			if ( null === $attribute_value ) {
				continue;
			}
			/*
			 * The namespace stack can hold false, which data_wp_interactive_processor() pushes for a
			 * `data-wp-interactive` whose namespace is invalid and which has no enclosing one to inherit. Only a
			 * string names a store, so anything else counts as no default namespace at all.
			 */
			$default_namespace = array_last( $this->namespace_stack ?? array() );
			if ( ! is_string( $default_namespace ) ) {
				$default_namespace = null;
			}

			list( $namespace, $value ) = $this->extract_directive_value( $attribute_value, $default_namespace );
			$entries[]                 = array(
				'namespace' => $namespace,
				'value'     => $value,
				'suffix'    => $suffix,
				'unique_id' => $unique_id,
			);
		}
		// Sort directive entries to ensure stable ordering with the client.
		// Put nulls first, then sort by suffix and finally by uniqueIds.
		usort(
			$entries,
			function ( $a, $b ) {
				$a_suffix = $a['suffix'] ?? '';
				$b_suffix = $b['suffix'] ?? '';
				if ( $a_suffix !== $b_suffix ) {
					return $a_suffix <=> $b_suffix;
				}
				$a_id = $a['unique_id'] ?? '';
				$b_id = $b['unique_id'] ?? '';
				return $a_id <=> $b_id;
			}
		);
		return $entries;
	}

	/**
	 * Transforms a kebab-case string to camelCase.
	 *
	 * @since 6.5.0
	 *
	 * @param string $str The kebab-case string to transform to camelCase.
	 * @return string The transformed camelCase string.
	 */
	private function kebab_to_camel_case( string $str ): string {
		return lcfirst(
			preg_replace_callback(
				'/(-)([a-z])/',
				function ( $matches ) {
					return strtoupper( $matches[2] );
				},
				strtolower( rtrim( $str, '-' ) )
			)
		);
	}

	/**
	 * Processes the `data-wp-interactive` directive.
	 *
	 * It adds the default store namespace defined in the directive value to the
	 * stack so that it's available for the nested interactivity elements.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p    The directives processor instance.
	 * @param string                                    $mode Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_interactive_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		// When exiting tags, it removes the last namespace from the stack.
		if ( 'exit' === $mode ) {
			array_pop( $this->namespace_stack );
			return;
		}

		// Tries to decode the `data-wp-interactive` attribute value.
		$attribute_value = $p->get_attribute( 'data-wp-interactive' );

		/*
		 * Pushes the newly defined namespace or the current one if the
		 * `data-wp-interactive` definition was invalid or does not contain a
		 * namespace. It does so because the function pops out the current namespace
		 * from the stack whenever it finds a `data-wp-interactive`'s closing tag,
		 * independently of whether the previous `data-wp-interactive` definition
		 * contained a valid namespace.
		 */
		$new_namespace = null;
		if ( is_string( $attribute_value ) && ! empty( $attribute_value ) ) {
			$decoded_json = json_decode( $attribute_value, true );
			if ( is_array( $decoded_json ) ) {
				$new_namespace = $decoded_json['namespace'] ?? null;
			} else {
				$new_namespace = $attribute_value;
			}
		}
		$this->namespace_stack[] = ( $new_namespace && 1 === preg_match( '/^([\w\-_\/]+)/', $new_namespace ) )
			? $new_namespace
			: end( $this->namespace_stack );
	}

	/**
	 * Processes the `data-wp-context` directive.
	 *
	 * It adds the context defined in the directive value to the stack so that
	 * it's available for the nested interactivity elements.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_context_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		// When exiting tags, it removes the last context from the stack.
		if ( 'exit' === $mode ) {
			array_pop( $this->context_stack );
			return;
		}

		$entries = $this->get_directive_entries( $p, 'context' );
		$context = end( $this->context_stack ) !== false ? end( $this->context_stack ) : array();
		foreach ( $entries as $entry ) {
			if ( null !== $entry['suffix'] ) {
				continue;
			}

			/*
			 * A context with no namespace has nothing to be stored under, so the inherited context is left as it
			 * is. Using the namespace as an array key regardless would coerce null to an empty string, which PHP
			 * 8.5 deprecates, and would store the context where no reference can address it anyway.
			 */
			if ( null === $entry['namespace'] ) {
				continue;
			}

			$context = array_replace_recursive(
				$context,
				array( $entry['namespace'] => is_array( $entry['value'] ) ? $entry['value'] : array() )
			);
		}
		$this->context_stack[] = $context;
	}

	/**
	 * Processes the `data-wp-bind` directive.
	 *
	 * It updates or removes the bound attributes based on the evaluation of its
	 * associated reference.
	 *
	 * @since 6.5.0
	 * @since 7.1.0 An object is resolved to whatever it serializes to for the client, a number is formatted by the
	 *              JSON encoder, and a value which cannot be sent to the client is rejected rather than passed to
	 *              WP_HTML_Tag_Processor::set_attribute().
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p    The directives processor instance.
	 * @param string                                    $mode Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_bind_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ): void {
		if ( 'enter' === $mode ) {
			$entries = $this->get_directive_entries( $p, 'bind' );
			foreach ( $entries as $entry ) {
				if ( empty( $entry['suffix'] ) || null !== $entry['unique_id'] ) {
					continue;
				}

				// Skip if the suffix is an event handler.
				if ( str_starts_with( $entry['suffix'], 'on' ) ) {
					_doing_it_wrong(
						__METHOD__,
						sprintf(
							/* translators: %s: The directive, e.g. data-wp-on--click. */
							__( 'Binding event handler attributes is not supported. Please use "%s" instead.' ),
							esc_attr( 'data-wp-on--' . substr( $entry['suffix'], 2 ) )
						),
						'6.9.2'
					);
					continue;
				}

				$result = $this->evaluate( $entry );

				/*
				 * An object is resolved to whatever it serializes to. When the reference points to a value stored
				 * in state or context, that is the value the client receives for it when the store is hydrated.
				 * A derived state closure is never serialized, so there the client value comes from the derived
				 * state's client-side implementation instead; the resolution is still applied so that both origins
				 * behave the same. Round-tripping through the JSON encoder rather than calling
				 * JsonSerializable::jsonSerialize() directly keeps this resolution identical to the client's,
				 * including for an object which serializes to another serializable object. When the encoding fails
				 * the object is left in place, to be reported as a usage error below. Note that it rarely does
				 * fail: wp_json_encode() retries through _wp_json_sanity_check(), which rebuilds the object from
				 * its public properties and so ignores jsonSerialize() altogether. An object whose serialized form
				 * JSON cannot represent therefore resolves to whatever that rebuild encodes to, which is what the
				 * client is sent for it as well.
				 *
				 * A throwing JsonSerializable::jsonSerialize() is caught for the same reason the value is checked
				 * at all: a binding must not be able to abort the render. An exception escaping here would leave
				 * `$context_stack` and `$namespace_stack` unrestored for every later `process_directives()` call
				 * on this instance, so the object is treated as one which failed to encode.
				 */
				if ( is_object( $result ) ) {
					try {
						$encoded = wp_json_encode( $result );
					} catch ( Throwable $e ) {
						$encoded = false;
					}
					if ( false !== $encoded ) {
						$result = json_decode( $encoded );
					}
				}

				/*
				 * Only a value which can be sent to the client may be stored in an attribute value. Strings and
				 * booleans are passed in as-is, numbers are formatted, and everything else is rejected as a usage
				 * error.
				 *
				 * An object which does not serialize to a scalar is rejected even when it defines `__toString()`,
				 * which PHP would otherwise coerce for the string parameters of the escaping functions. Its string
				 * representation is not what the client evaluates this reference to, whether that is the form
				 * serialized into the store or the return value of a derived state's client-side implementation,
				 * so the two could disagree once the directive is evaluated during hydration.
				 */
				if ( null !== $result ) {
					if ( ! is_scalar( $result ) ) {
						_doing_it_wrong(
							__METHOD__,
							sprintf(
								/* translators: %s: The attribute name. */
								__( 'Attempted to bind a non-scalar value to the "%s" attribute. Ensure the state/context property or the derived state closure resolves to a string, number, or boolean.' ),
								esc_html( $entry['suffix'] )
							),
							'7.1.0'
						);
						$result = null;
					} elseif ( is_int( $result ) || is_float( $result ) ) {
						/*
						 * A number is formatted by the JSON encoder rather than cast to string, so that the
						 * attribute value matches the number the client receives for this same reference. Casting
						 * a float is locale-dependent before PHP 8.0, and rounds to `precision` rather than to the
						 * encoder's `serialize_precision`.
						 *
						 * This closes the cases which differ in practice, not every one. A float written in
						 * exponent notation still disagrees, since PHP encodes 1e25 as `1.0e+25` where JavaScript
						 * renders it as `1e+25`, as does negative zero, and an integer above the range JavaScript
						 * can represent exactly is rounded once it reaches the client. Casting diverged on all
						 * three as well, so none is a regression.
						 */
						$encoded = wp_json_encode( $result );
						if ( JSON_ERROR_INF_OR_NAN === json_last_error() ) {
							/*
							 * The encoder only rejects INF and NAN, of which JSON can represent neither. When such
							 * a value is stored in state, the store itself also fails to encode in its entirety,
							 * and the client is sent an empty script tag in place of all of its state; only
							 * removing the value from the state resolves that. A derived state closure returning
							 * one never reaches the store, so there only the binding itself is affected.
							 */
							_doing_it_wrong(
								__METHOD__,
								sprintf(
									/* translators: %s: The attribute name. */
									__( 'Attempted to bind a non-finite number to the "%s" attribute. Ensure the state/context property or the derived state closure resolves to a finite number or a string.' ),
									esc_html( $entry['suffix'] )
								),
								'7.1.0'
							);
							$result = null;
						} else {
							$result = $encoded;
						}
					}
				}

				if (
					null !== $result &&
					(
						false !== $result ||
						( strlen( $entry['suffix'] ) > 5 && '-' === $entry['suffix'][4] )
					)
				) {
					/*
					 * If the result of the evaluation is a boolean and the attribute is
					 * `aria-` or `data-, convert it to a string "true" or "false". It
					 * follows the exact same logic as Preact because it needs to
					 * replicate what Preact will later do in the client:
					 * https://github.com/preactjs/preact/blob/ea49f7a0f9d1ff2c98c0bdd66aa0cbc583055246/src/diff/props.js#L131C24-L136
					 */
					if (
						is_bool( $result ) &&
						( strlen( $entry['suffix'] ) > 5 && '-' === $entry['suffix'][4] )
					) {
						$result = $result ? 'true' : 'false';
					}
					$p->set_attribute( $entry['suffix'], $result );
				} else {
					$p->remove_attribute( $entry['suffix'] );
				}
			}
		}
	}

	/**
	 * Processes the `data-wp-class` directive.
	 *
	 * It adds or removes CSS classes in the current HTML element based on the
	 * evaluation of its associated references.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$entries = $this->get_directive_entries( $p, 'class' );
			foreach ( $entries as $entry ) {
				if ( empty( $entry['suffix'] ) ) {
					continue;
				}
				$class_name = isset( $entry['unique_id'] ) && $entry['unique_id']
					? "{$entry['suffix']}---{$entry['unique_id']}"
					: $entry['suffix'];

				if ( empty( $class_name ) ) {
					return;
				}

				$result = $this->evaluate( $entry );

				if ( $result ) {
					$p->add_class( $class_name );
				} else {
					$p->remove_class( $class_name );
				}
			}
		}
	}

	/**
	 * Processes the `data-wp-style` directive.
	 *
	 * It updates the style attribute value of the current HTML element based on
	 * the evaluation of its associated references.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_style_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$entries = $this->get_directive_entries( $p, 'style' );
			foreach ( $entries as $entry ) {
				$style_property = $entry['suffix'];
				if ( empty( $style_property ) || null !== $entry['unique_id'] ) {
					continue;
				}

				$style_property_value  = $this->evaluate( $entry );
				$style_attribute_value = $p->get_attribute( 'style' );
				$style_attribute_value = ( $style_attribute_value && ! is_bool( $style_attribute_value ) ) ? $style_attribute_value : '';

				/*
				 * Checks first if the style property is not falsy and the style
				 * attribute value is not empty because if it is, it doesn't need to
				 * update the attribute value.
				 */
				if ( $style_property_value || $style_attribute_value ) {
					$style_attribute_value = $this->merge_style_property( $style_attribute_value, $style_property, $style_property_value );
					/*
					 * If the style attribute value is not empty, it sets it. Otherwise,
					 * it removes it.
					 */
					if ( ! empty( $style_attribute_value ) ) {
						$p->set_attribute( 'style', $style_attribute_value );
					} else {
						$p->remove_attribute( 'style' );
					}
				}
			}
		}
	}

	/**
	 * Merges an individual style property in the `style` attribute of an HTML
	 * element, updating or removing the property when necessary.
	 *
	 * If a property is modified, the old one is removed and the new one is added
	 * at the end of the list.
	 *
	 * @since 6.5.0
	 *
	 * Example:
	 *
	 *     merge_style_property( 'color:green;', 'color', 'red' )      => 'color:red;'
	 *     merge_style_property( 'background:green;', 'color', 'red' ) => 'background:green;color:red;'
	 *     merge_style_property( 'color:green;', 'color', null )       => ''
	 *
	 * @param string            $style_attribute_value The current style attribute value.
	 * @param string            $style_property_name   The style property name to set.
	 * @param string|false|null $style_property_value  The value to set for the style property. With false, null or an
	 *                                                 empty string, it removes the style property.
	 * @return string The new style attribute value after the specified property has been added, updated or removed.
	 */
	private function merge_style_property( string $style_attribute_value, string $style_property_name, $style_property_value ): string {
		$style_assignments    = explode( ';', $style_attribute_value );
		$result               = array();
		$style_property_value = ! empty( $style_property_value ) ? rtrim( trim( $style_property_value ), ';' ) : null;
		$new_style_property   = $style_property_value ? $style_property_name . ':' . $style_property_value . ';' : '';

		// Generates an array with all the properties but the modified one.
		foreach ( $style_assignments as $style_assignment ) {
			if ( empty( trim( $style_assignment ) ) ) {
				continue;
			}
			list( $name, $value ) = explode( ':', $style_assignment );
			if ( trim( $name ) !== $style_property_name ) {
				$result[] = trim( $name ) . ':' . trim( $value ) . ';';
			}
		}

		// Adds the new/modified property at the end of the list.
		$result[] = $new_style_property;

		return implode( '', $result );
	}

	/**
	 * Processes the `data-wp-text` directive.
	 *
	 * It updates the inner content of the current HTML element based on the
	 * evaluation of its associated reference.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_text_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode ) {
			$entries     = $this->get_directive_entries( $p, 'text' );
			$valid_entry = null;
			// Get the first valid `data-wp-text` entry without suffix or unique ID.
			foreach ( $entries as $entry ) {
				if ( null === $entry['suffix'] && null === $entry['unique_id'] && ! empty( $entry['value'] ) ) {
					$valid_entry = $entry;
					break;
				}
			}
			if ( null === $valid_entry ) {
				return;
			}
			$result = $this->evaluate( $valid_entry );

			/*
			 * Follows the same logic as Preact in the client and only changes the
			 * content if the value is a string or a number. Otherwise, it removes the
			 * content.
			 */
			if ( is_string( $result ) || is_numeric( $result ) ) {
				$p->set_content_between_balanced_tags( esc_html( $result ) );
			} else {
				$p->set_content_between_balanced_tags( '' );
			}
		}
	}

	/**
	 * Returns the CSS styles for animating the top loading bar in the router.
	 *
	 * @since 6.5.0
	 *
	 * @return string The CSS styles for the router's top loading bar animation.
	 */
	private function get_router_animation_styles(): string {
		return <<<CSS
			.wp-interactivity-router-loading-bar {
				position: fixed;
				top: 0;
				left: 0;
				margin: 0;
				padding: 0;
				width: 100vw;
				max-width: 100vw !important;
				height: 4px;
				background-color: #000;
				opacity: 0
			}
			.wp-interactivity-router-loading-bar.start-animation {
				animation: wp-interactivity-router-loading-bar-start-animation 30s cubic-bezier(0.03, 0.5, 0, 1) forwards
			}
			.wp-interactivity-router-loading-bar.finish-animation {
				animation: wp-interactivity-router-loading-bar-finish-animation 300ms ease-in
			}
			@keyframes wp-interactivity-router-loading-bar-start-animation {
				0% { transform: scaleX(0); transform-origin: 0 0; opacity: 1 }
				100% { transform: scaleX(1); transform-origin: 0 0; opacity: 1 }
			}
			@keyframes wp-interactivity-router-loading-bar-finish-animation {
				0% { opacity: 1 }
				50% { opacity: 1 }
				100% { opacity: 0 }
			}
CSS;
	}

	/**
	 * Deprecated.
	 *
	 * @since 6.5.0
	 * @deprecated 6.7.0 Use {@see WP_Interactivity_API::print_router_markup} instead.
	 */
	public function print_router_loading_and_screen_reader_markup() {
		_deprecated_function( __METHOD__, '6.7.0', 'WP_Interactivity_API::print_router_markup' );

		// Call the new method.
		$this->print_router_markup();
	}

	/**
	 * Outputs markup for the @wordpress/interactivity-router script module.
	 *
	 * This method prints a div element representing a loading bar visible during
	 * navigation.
	 *
	 * @since 6.7.0
	 */
	public function print_router_markup() {
		echo <<<HTML
			<div
				class="wp-interactivity-router-loading-bar"
				data-wp-interactive="core/router/private"
				data-wp-class--start-animation="state.navigation.hasStarted"
				data-wp-class--finish-animation="state.navigation.hasFinished"
			></div>
HTML;
	}

	/**
	 * Processes the `data-wp-router-region` directive.
	 *
	 * It renders in the footer a set of HTML elements to notify users about
	 * client-side navigations. More concretely, the elements added are 1) a
	 * top loading bar to visually inform that a navigation is in progress
	 * and 2) an `aria-live` region for accessible navigation announcements.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 */
	private function data_wp_router_region_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
		if ( 'enter' === $mode && ! $this->has_processed_router_region ) {
			$this->has_processed_router_region = true;

			// Initializes the `state.url` property from the server.
			$this->state(
				'core/router',
				array(
					'url' => get_self_link(),
				)
			);

			// Enqueues as an inline style.
			wp_register_style( 'wp-interactivity-router-animations', false );
			wp_add_inline_style( 'wp-interactivity-router-animations', $this->get_router_animation_styles() );
			wp_enqueue_style( 'wp-interactivity-router-animations' );

			// Adds the necessary markup to the footer.
			add_action( 'wp_footer', array( $this, 'print_router_markup' ) );
		}
	}

	/**
	 * Processes the `data-wp-each` directive.
	 *
	 * This directive gets an array passed as reference and iterates over it
	 * generating new content for each item based on the inner markup of the
	 * `template` tag.
	 *
	 * @since 6.5.0
	 * @since 6.9.0 Include the list path in the rendered `data-wp-each-child` directives.
	 *
	 * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
	 * @param string                                    $mode            Whether the processing is entering or exiting the tag.
	 * @param array                                     $tag_stack       The reference to the tag stack.
	 */
	private function data_wp_each_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$tag_stack ) {
		if ( 'enter' === $mode && 'TEMPLATE' === $p->get_tag() ) {
			$entries = $this->get_directive_entries( $p, 'each' );
			if ( count( $entries ) > 1 || empty( $entries ) ) {
				// There should be only one `data-wp-each` directive per template tag.
				return;
			}
			$entry = $entries[0];
			if ( null !== $entry['unique_id'] ) {
				return;
			}
			$item_name = isset( $entry['suffix'] ) ? $this->kebab_to_camel_case( $entry['suffix'] ) : 'item';
			$result    = $this->evaluate( $entry );

			// Gets the content between the template tags and leaves the cursor in the closer tag.
			$inner_content = $p->get_content_between_balanced_template_tags();

			// Checks if there is a manual server-side directive processing.
			$template_end = 'data-wp-each: template end';
			$p->set_bookmark( $template_end );
			$p->next_tag();
			$manual_sdp = $p->get_attribute( 'data-wp-each-child' );
			$p->seek( $template_end ); // Rewinds to the template closer tag.
			$p->release_bookmark( $template_end );

			/*
			 * It doesn't process in these situations:
			 * - Manual server-side directive processing.
			 * - Empty or non-array values.
			 * - Associative arrays because those are deserialized as objects in JS.
			 * - Templates that contain top-level texts because those texts can't be
			 *   identified and removed in the client.
			 */
			if (
				$manual_sdp ||
				empty( $result ) ||
				! is_array( $result ) ||
				! array_is_list( $result ) ||
				! str_starts_with( trim( $inner_content ), '<' ) ||
				! str_ends_with( trim( $inner_content ), '>' )
			) {
				array_pop( $tag_stack );
				return;
			}

			// Processes the inner content for each item of the array.
			$processed_content = '';
			foreach ( $result as $item ) {
				// Creates a new context that includes the current item of the array.
				$this->context_stack[] = array_replace_recursive(
					end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
					array( $entry['namespace'] => array( $item_name => $item ) )
				);

				// Processes the inner content with the new context.
				$processed_item = $this->_process_directives( $inner_content );

				if ( null === $processed_item ) {
					// If the HTML is unbalanced, stop processing it.
					array_pop( $this->context_stack );
					return;
				}

				/*
				 * Adds the `data-wp-each-child` directive to each top-level tag
				 * rendered by this `data-wp-each` directive. The value is the
				 * `data-wp-each` directive's namespace and path.
				 *
				 * Nested `data-wp-each` directives could render
				 * `data-wp-each-child` elements at the top level as well, and
				 * they should be overwritten.
				 *
				 * @since 6.9.0
				 */
				$i = new WP_Interactivity_API_Directives_Processor( $processed_item );
				while ( $i->next_tag() ) {
					$i->set_attribute( 'data-wp-each-child', $entry['namespace'] . '::' . $entry['value'] );
					$i->next_balanced_tag_closer_tag();
				}
				$processed_content .= $i->get_updated_html();

				// Removes the current context from the stack.
				array_pop( $this->context_stack );
			}

			// Appends the processed content after the tag closer of the template.
			$p->append_content_after_template_tag_closer( $processed_content );

			// Pops the last tag because it skipped the closing tag of the template tag.
			array_pop( $tag_stack );
		}
	}
}