diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
index 472115e121..5208594799 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php
@@ -1781,6 +1781,10 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			$rels[] = 'https://api.w.org/action-publish';
 		}
 
+		if ( current_user_can( 'unfiltered_html' ) ) {
+			$rels[] = 'https://api.w.org/action-unfiltered-html';
+		}
+
 		if ( 'post' === $post_type->name ) {
 			if ( current_user_can( $post_type->cap->edit_others_posts ) && current_user_can( $post_type->cap->publish_posts ) ) {
 				$rels[] = 'https://api.w.org/action-sticky';
@@ -2190,6 +2194,20 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 			);
 		}
 
+		$links[] = array(
+			'rel'          => 'https://api.w.org/action-unfiltered-html',
+			'title'        => __( 'The current user can post HTML markup and JavaScript.' ),
+			'href'         => $href,
+			'targetSchema' => array(
+				'type'       => 'object',
+				'properties' => array(
+					'unfiltered_html' => array(
+						'type'        => 'boolean',
+					),
+				),
+			),
+		);
+
 		if ( 'post' === $this->post_type ) {
 			$links[] = array(
 				'rel'          => 'https://api.w.org/action-sticky',
diff --git a/tests/phpunit/tests/rest-api/rest-posts-controller.php b/tests/phpunit/tests/rest-api/rest-posts-controller.php
index 0de10c9651..ded82940ee 100644
--- a/tests/phpunit/tests/rest-api/rest-posts-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-posts-controller.php
@@ -3992,6 +3992,42 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->assertArrayHasKey( 'https://api.w.org/action-assign-tags', $links );
 	}
 
+	public function test_assign_unfiltered_html_action_superadmin() {
+		$post_id = self::factory()->post->create();
+		wp_set_current_user( self::$superadmin_id );
+		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . $post_id );
+		$request->set_param( 'context', 'edit' );
+		$response = rest_do_request( $request );
+		$links    = $response->get_links();
+		$this->assertArrayHasKey( 'https://api.w.org/action-unfiltered-html', $links );
+	}
+
+	public function test_assign_unfiltered_html_action_editor() {
+		$post_id = self::factory()->post->create();
+		wp_set_current_user( self::$editor_id );
+		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . $post_id );
+		$request->set_param( 'context', 'edit' );
+		$response = rest_do_request( $request );
+		$links    = $response->get_links();
+		// Editors can only unfiltered html on single site.
+		if ( is_multisite() ) {
+			$this->assertArrayNotHasKey( 'https://api.w.org/action-unfiltered-html', $links );
+		} else {
+			$this->assertArrayHasKey( 'https://api.w.org/action-unfiltered-html', $links );
+		}
+	}
+
+	public function test_assign_unfiltered_html_action_author() {
+		$post_id = self::factory()->post->create();
+		wp_set_current_user( self::$author_id );
+		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . $post_id );
+		$request->set_param( 'context', 'edit' );
+		$response = rest_do_request( $request );
+		$links    = $response->get_links();
+		// Authors can't ever unfiltered html
+		$this->assertArrayNotHasKey( 'https://api.w.org/action-unfiltered-html', $links );
+	}
+
 	public function tearDown() {
 		_unregister_post_type( 'youseeeme' );
 		if ( isset( $this->attachment_id ) ) {