diff --git a/amp.php b/amp.php
index 883aaa78bc5..76164b750c1 100644
--- a/amp.php
+++ b/amp.php
@@ -5,7 +5,7 @@
  * Plugin URI: https://amp-wp.org
  * Author: AMP Project Contributors
  * Author URI: https://github.com/ampproject/amp-wp/graphs/contributors
- * Version: 1.1.0
+ * Version: 1.1.1
  * Text Domain: amp
  * Domain Path: /languages/
  * License: GPLv2 or later
@@ -115,7 +115,7 @@ function _amp_print_build_needed_notice() {
 
 define( 'AMP__FILE__', __FILE__ );
 define( 'AMP__DIR__', dirname( __FILE__ ) );
-define( 'AMP__VERSION', '1.1.0' );
+define( 'AMP__VERSION', '1.1.1' );
 
 /**
  * Print admin notice if plugin installed with incorrect slug (which impacts WordPress's auto-update system).
diff --git a/bin/tag-built.sh b/bin/tag-built.sh
index 88fc02f7ccc..1665521a250 100755
--- a/bin/tag-built.sh
+++ b/bin/tag-built.sh
@@ -2,11 +2,15 @@
 
 set -e
 
-tag=$(git describe --tags)
+tag=$(cat build/amp.php | grep 'Version:' | sed 's/.*: //')
 if [[ -z "$tag" ]]; then
-    echo "Error: Unable to determine tag."
+    echo "Error: Unable to determine tag from build/amp.php."
     exit 1
 fi
+if ! git rev-parse "$tag" >/dev/null 2>&1; then
+    echo "Error: Tag does not exist: $tag"
+    exit 2
+fi
 
 built_tag="$tag-built"
 if git rev-parse "$built_tag" >/dev/null 2>&1; then
@@ -19,8 +23,9 @@ if ! git diff-files --quiet || ! git diff-index --quiet --cached HEAD --; then
     exit 3
 fi
 
-git checkout "$tag"
-npm run build
+if [[ -e built ]]; then
+    rm -rf built
+fi
 mkdir built
 git clone . built/
 cd built
diff --git a/contributing.md b/contributing.md
index bf6fd9cf605..54cebb34303 100644
--- a/contributing.md
+++ b/contributing.md
@@ -169,9 +169,10 @@ Contributors who want to make a new release, follow these steps:
 7. Run `npm run deploy` to commit the plugin to WordPress.org.
 8. Confirm the release is available on WordPress.org; try installing it on a WordPress install and confirm it works.
 9. Publish GitHub release.
-10. Create built release tag: `git fetch --tags && git checkout $(git tag | tail -n1) && ./bin/tag-built.sh` (then add link from release)
-11. Create a new branch off of the release branch (e.g. `update/develop-with-1.0.x`), merge `develop` into it and resolve conflicts (e.g. with version), and then open pull request to merge changes into `develop`.
-12. Merge release tag into `master`.
-13. Publish release blog post, including link to GitHub release.
-14. Close the GitHub milestone and project.
-15. Make announcements.
+10. Create built release tag (from the just-created `build` directory): `git fetch --tags && ./bin/tag-built.sh` (then add link from release)
+11. For new major/minor releases, create a release branch from the tag. Patch versions are made from the release branch.
+12. Bump `Stable tag` in the `readme.txt`/`readme.md` in `develop`. Cherry-pick other changes as necessary.
+13. Merge release tag into `master`.
+14. Publish release blog post, including link to GitHub release.
+15. Close the GitHub milestone and project.
+16. Make announcements.
diff --git a/includes/class-amp-comment-walker.php b/includes/class-amp-comment-walker.php
index c5b3f3c79c3..811b98b7e91 100644
--- a/includes/class-amp-comment-walker.php
+++ b/includes/class-amp-comment-walker.php
@@ -6,7 +6,8 @@
  * @package AMP
  */
 
-_deprecated_file( __FILE__, '1.1', null, esc_html__( 'AMP_Comment_Walker functionality has been moved to AMP_Comments_Sanitizer.', 'amp' ) );
+/* translators: 1: AMP_Comment_Walker. 2: AMP_Comments_Sanitizer. */
+_deprecated_file( __FILE__, '1.1', null, sprintf( esc_html__( '%1$s functionality has been moved to %2$s.', 'amp' ), 'AMP_Comment_Walker', 'AMP_Comments_Sanitizer' ) );
 
 /**
  * Class AMP_Comment_Walker
diff --git a/includes/class-amp-service-worker.php b/includes/class-amp-service-worker.php
index 0dfb36295d7..bc70a78ee9b 100644
--- a/includes/class-amp-service-worker.php
+++ b/includes/class-amp-service-worker.php
@@ -83,7 +83,8 @@ public static function add_query_var( $vars ) {
 	 */
 	public static function add_cdn_script_caching( $service_workers ) {
 		if ( ! ( $service_workers instanceof WP_Service_Worker_Scripts ) ) {
-			_doing_it_wrong( __METHOD__, esc_html__( 'Please update to PWA v0.2. Expected argument to be WP_Service_Worker_Cache_Registry.', 'amp' ), '1.1' );
+			/* translators: %s: WP_Service_Worker_Cache_Registry. */
+			_doing_it_wrong( __METHOD__, sprintf( esc_html__( 'Please update to PWA v0.2. Expected argument to be %s.', 'amp' ), 'WP_Service_Worker_Cache_Registry' ), '1.1' );
 			return;
 		}
 
diff --git a/includes/options/class-amp-options-manager.php b/includes/options/class-amp-options-manager.php
index c270c2a522b..8bd4b7ef1f8 100644
--- a/includes/options/class-amp-options-manager.php
+++ b/includes/options/class-amp-options-manager.php
@@ -537,7 +537,7 @@ public static function handle_updated_theme_support_option() {
 			if ( is_wp_error( $validation ) ) {
 				$review_messages[] = esc_html(
 					sprintf(
-						/* translators: %1$s is the error message, %2$s is the error code */
+						/* translators: 1: error message. 2: error code. */
 						__( 'However, there was an error when checking the AMP validity for your site.', 'amp' ),
 						$validation->get_error_message(),
 						$validation->get_error_code()
@@ -616,7 +616,7 @@ public static function handle_updated_theme_support_option() {
 					if ( $new_errors > 0 && $invalid_url_screen_url ) {
 						$message .= ' ' . wp_kses_post(
 							sprintf(
-								/* translators: %1$s is URL to review issues, %2$s is count of new errors */
+								/* translators: 1: URL to review issues. 2: count of new errors. */
 								_n(
 									'Please also <a href="%1$s">review %2$s issue</a> which may need to be fixed (for one URL at least).',
 									'Please also <a href="%1$s">review %2$s issues</a> which may need to be fixed (for one URL at least).',
diff --git a/includes/options/class-amp-options-menu.php b/includes/options/class-amp-options-menu.php
index 17b85185692..3ea8476ae03 100644
--- a/includes/options/class-amp-options-menu.php
+++ b/includes/options/class-amp-options-menu.php
@@ -210,7 +210,7 @@ public function render_theme_support() {
 									<?php
 									echo wp_kses_post(
 										sprintf(
-											/* translators: %1$s is link to invalid URLs and %2$s is link to validation errors */
+											/* translators: %1: link to invalid URLs. 2: link to validation errors. */
 											__( 'View current site compatibility results for native and transitional modes: %1$s and %2$s.', 'amp' ),
 											sprintf(
 												'<a href="%s">%s</a>',
diff --git a/includes/options/views/class-amp-analytics-options-submenu-page.php b/includes/options/views/class-amp-analytics-options-submenu-page.php
index 655275f48ad..68c0ef3e27e 100644
--- a/includes/options/views/class-amp-analytics-options-submenu-page.php
+++ b/includes/options/views/class-amp-analytics-options-submenu-page.php
@@ -106,7 +106,7 @@ public function render_title( $has_entries = false ) {
 								/* translators: 1: AMP Analytics docs URL. 2: AMP for WordPress analytics docs URL. 3: AMP analytics code reference. 4: amp-analytics, 5: {. 6: }. 7: <script>, 8: googleanalytics. 9: AMP analytics vendor docs URL. 10: UA-XXXXX-Y. */
 								__( 'For Google Analytics, please see <a href="%1$s" target="_blank">Adding Analytics to your AMP pages</a>; see also the <a href="%2$s" target="_blank">Analytics wiki page</a> and the AMP project\'s <a href="%3$s" target="_blank">%4$s documentation</a>. The analytics configuration supplied below must take the form of JSON objects, which begin with a %5$s and end with a %6$s. Do not include any HTML tags like %4$s or %7$s. A common entry would have the type %8$s (see <a href="%9$s" target="_blank">available vendors</a>) and a configuration that looks like the following (where %10$s is replaced with your own site\'s account number):', 'amp' ),
 								__( 'https://developers.google.com/analytics/devguides/collection/amp-analytics/', 'amp' ),
-								__( 'https://github.com/ampproject/amp-wp/wiki/Analytics', 'amp' ),
+								__( 'https://amp-wp.org/documentation/playbooks/analytics/', 'amp' ),
 								__( 'https://www.ampproject.org/docs/reference/components/amp-analytics', 'amp' ),
 								'<code>amp-analytics</code>',
 								'<code>{</code>',
diff --git a/includes/sanitizers/class-amp-style-sanitizer.php b/includes/sanitizers/class-amp-style-sanitizer.php
index 721569d600d..84c4d6c0fbc 100644
--- a/includes/sanitizers/class-amp-style-sanitizer.php
+++ b/includes/sanitizers/class-amp-style-sanitizer.php
@@ -2404,7 +2404,7 @@ private function finalize_styles() {
 				) . "\n" . implode( "\n", $included_sources ) . "\n";
 				if ( self::has_required_php_css_parser() ) {
 					$comment .= sprintf(
-						/* translators: %1$d is number of included bytes, %2$d is percentage of total CSS actually included after tree shaking, %3$d is total included size */
+						/* translators: 1: number of included bytes. 2: percentage of total CSS actually included after tree shaking. 3: total included size. */
 						esc_html__( 'Total included size: %1$s bytes (%2$d%% of %3$s total after tree shaking)', 'amp' ),
 						number_format_i18n( $included_size ),
 						$included_size / $included_original_size * 100,
@@ -2412,8 +2412,8 @@ private function finalize_styles() {
 					) . "\n";
 				} else {
 					$comment .= sprintf(
-						/* translators: %1$d is number of included bytes */
-						esc_html__( 'Total included size: %1$s bytes', 'amp' ),
+						/* translators: %s: number of included bytes. */
+						esc_html__( 'Total included size: %s bytes', 'amp' ),
 						number_format_i18n( $included_size ),
 						$included_size / $included_original_size * 100,
 						number_format_i18n( $included_original_size )
diff --git a/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php b/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php
index 46a42986f15..8cbf5ed5f19 100644
--- a/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php
+++ b/includes/sanitizers/class-amp-tag-and-attribute-sanitizer.php
@@ -1841,7 +1841,7 @@ private function check_valid_children( $node, $child_tags ) {
 		}
 
 		// If the first element is not of the required type, invalidate the entire element.
-		if ( isset( $child_tags['first_child_tag_name_oneof'] ) && ( empty( $child_elements[0] ) || ! in_array( $child_elements[0]->nodeName, $child_tags['first_child_tag_name_oneof'], true ) ) ) {
+		if ( isset( $child_tags['first_child_tag_name_oneof'] ) && ! empty( $child_elements[0] ) && ! in_array( $child_elements[0]->nodeName, $child_tags['first_child_tag_name_oneof'], true ) ) {
 			return false;
 		}
 
diff --git a/includes/validation/class-amp-validated-url-post-type.php b/includes/validation/class-amp-validated-url-post-type.php
index 15ec5df7601..69e869a58c0 100644
--- a/includes/validation/class-amp-validated-url-post-type.php
+++ b/includes/validation/class-amp-validated-url-post-type.php
@@ -457,7 +457,7 @@ public static function display_invalid_url_validation_error_counts_summary( $pos
 		$result = array();
 		if ( $counts['new_rejected'] ) {
 			$result[] = sprintf(
-				/* translators: %1$s is the status, %2$s is the count */
+				/* translators: 1: status. 2: count. */
 				'<span class="status-text new new-rejected">%1$s: %2$s</span>',
 				esc_html__( 'New Rejected', 'amp' ),
 				number_format_i18n( $counts['new_rejected'] )
@@ -465,7 +465,7 @@ public static function display_invalid_url_validation_error_counts_summary( $pos
 		}
 		if ( $counts['new_accepted'] ) {
 			$result[] = sprintf(
-				/* translators: %1$s is the status, %2$s is the count */
+				/* translators: 1: status. 2: count. */
 				'<span class="status-text new new-accepted">%1$s: %2$s</span>',
 				esc_html__( 'New Accepted', 'amp' ),
 				number_format_i18n( $counts['new_accepted'] )
@@ -653,9 +653,14 @@ public static function store_validation_errors( $validation_errors, $url, $args
 		$stored_validation_errors = array();
 
 		// Prevent Kses from corrupting JSON in description.
-		$has_pre_term_description_filter = has_filter( 'pre_term_description', 'wp_filter_kses' );
-		if ( false !== $has_pre_term_description_filter ) {
-			remove_filter( 'pre_term_description', 'wp_filter_kses', $has_pre_term_description_filter );
+		$pre_term_description_filters = array(
+			'wp_filter_kses'       => has_filter( 'pre_term_description', 'wp_filter_kses' ),
+			'wp_targeted_link_rel' => has_filter( 'pre_term_description', 'wp_targeted_link_rel' ),
+		);
+		foreach ( $pre_term_description_filters as $callback => $priority ) {
+			if ( false !== $priority ) {
+				remove_filter( 'pre_term_description', $callback, $priority );
+			}
 		}
 
 		$terms = array();
@@ -713,8 +718,10 @@ public static function store_validation_errors( $validation_errors, $url, $args
 		}
 
 		// Finish preventing Kses from corrupting JSON in description.
-		if ( false !== $has_pre_term_description_filter ) {
-			add_filter( 'pre_term_description', 'wp_filter_kses', $has_pre_term_description_filter );
+		foreach ( $pre_term_description_filters as $callback => $priority ) {
+			if ( false !== $priority ) {
+				add_filter( 'pre_term_description', $callback, $priority );
+			}
 		}
 
 		$post_content = wp_json_encode( $stored_validation_errors );
diff --git a/readme.md b/readme.md
index a4de3e8a27c..480c52b421e 100644
--- a/readme.md
+++ b/readme.md
@@ -8,7 +8,7 @@ Enable AMP on your WordPress site, the WordPress way.
 **Tags:** [amp](https://wordpress.org/plugins/tags/amp), [mobile](https://wordpress.org/plugins/tags/mobile)  
 **Requires at least:** 4.9  
 **Tested up to:** 5.1  
-**Stable tag:** 1.1.0  
+**Stable tag:** 1.1.1  
 **License:** [GPLv2 or later](http://www.gnu.org/licenses/gpl-2.0.html)  
 **Requires PHP:** 5.4  
 
diff --git a/readme.txt b/readme.txt
index 6b8a657eba5..13e9de444bc 100644
--- a/readme.txt
+++ b/readme.txt
@@ -3,7 +3,7 @@ Contributors: automattic, xwp, google, westonruter, ryankienstra, batmoo, stubgo
 Tags: amp, mobile
 Requires at least: 4.9
 Tested up to: 5.1
-Stable tag: 1.1.0
+Stable tag: 1.1.1
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 Requires PHP: 5.4
diff --git a/tests/test-tag-and-attribute-sanitizer.php b/tests/test-tag-and-attribute-sanitizer.php
index 4ec03074dc2..c33e325da42 100644
--- a/tests/test-tag-and-attribute-sanitizer.php
+++ b/tests/test-tag-and-attribute-sanitizer.php
@@ -979,6 +979,12 @@ function() {
 				array(),
 			),
 
+			'amp-state-src' => array(
+				'<amp-state id="myRemoteState" src="https://data.com/articles.json"></amp-state>',
+				null,
+				array( 'amp-bind' ),
+			),
+
 			// Adapted from <https://www.ampproject.org/docs/reference/components/amp-selector>.
 			'reference-points-amp_selector_and_carousel_with_boolean_attributes' => array(
 				str_replace(
diff --git a/tests/validation/test-class-amp-validated-url-post-type.php b/tests/validation/test-class-amp-validated-url-post-type.php
index bc35b0e68c9..b52d056c1ac 100644
--- a/tests/validation/test-class-amp-validated-url-post-type.php
+++ b/tests/validation/test-class-amp-validated-url-post-type.php
@@ -375,6 +375,16 @@ function( $sanitized, $error ) {
 					),
 				),
 			),
+			array(
+				'code'    => 'rejected',
+				'evil'    => '<script>document.write( \'<a href="#" target="_blank" rel="noopener noreferrer">test</a>\' );</script>', // Test protection against wp_targeted_link_rel JSON corruption.
+				'sources' => array(
+					array(
+						'type' => 'theme',
+						'name' => 'twentyseventeen',
+					),
+				),
+			),
 			array(
 				'code'    => 'new',
 				'sources' => array(
@@ -451,6 +461,7 @@ function( $stored_error ) {
 		$error_groups = array(
 			AMP_Validation_Error_Taxonomy::VALIDATION_ERROR_ACK_ACCEPTED_STATUS,
 			AMP_Validation_Error_Taxonomy::VALIDATION_ERROR_ACK_REJECTED_STATUS,
+			AMP_Validation_Error_Taxonomy::VALIDATION_ERROR_ACK_REJECTED_STATUS,
 			AMP_Validation_Error_Taxonomy::VALIDATION_ERROR_NEW_ACCEPTED_STATUS,
 		);