diff --git a/assets/js/amp-editor-blocks.js b/assets/js/amp-editor-blocks.js
index 56824a489d4..fffb7720f86 100644
--- a/assets/js/amp-editor-blocks.js
+++ b/assets/js/amp-editor-blocks.js
@@ -507,7 +507,7 @@ var ampEditorBlocks = ( function() { // eslint-disable-line no-unused-vars
 						props.setAttributes( { height: nextHeight } );
 					}
 				} ),
-				maxFont > height && el(
+				parseInt( maxFont ) > parseInt( height ) && el(
 					wp.components.Notice,
 					{
 						status: 'error',
@@ -530,7 +530,7 @@ var ampEditorBlocks = ( function() { // eslint-disable-line no-unused-vars
 						}
 					} )
 				),
-				minFont > maxFont && el(
+				parseInt( minFont ) > parseInt( maxFont ) && el(
 					wp.components.Notice,
 					{
 						status: 'error',
diff --git a/blocks/amp-story/block-navigation.js b/blocks/amp-story/block-navigation.js
index 842f2e3fd9e..1886fe875d8 100644
--- a/blocks/amp-story/block-navigation.js
+++ b/blocks/amp-story/block-navigation.js
@@ -1,8 +1,3 @@
-/**
- * External dependencies
- */
-import { map, noop } from 'lodash';
-
 /**
  * WordPress dependencies
  */
@@ -26,7 +21,7 @@ function BlockNavigationList( {
 		 */
 		/* eslint-disable jsx-a11y/no-redundant-roles */
 		<ul key='navigation-list' className="editor-block-navigation__list" role="list">
-			{ map( blocks, ( block ) => {
+			{ _.map( blocks, ( block ) => {
 				const blockType = getBlockType( block.name );
 				const isSelected = block.clientId === selectedBlockClientId;
 				let className = 'editor-block-navigation__item-button';
@@ -117,7 +112,7 @@ export default compose(
 			selectedBlockClientId
 		};
 	} ),
-	withDispatch( ( dispatch, { onSelect = noop } ) => {
+	withDispatch( ( dispatch, { onSelect = _.noop } ) => {
 		return {
 			selectBlock( clientId ) {
 				dispatch( 'core/editor' ).selectBlock( clientId );
diff --git a/includes/admin/class-amp-editor-blocks.php b/includes/admin/class-amp-editor-blocks.php
index 3e1ab795342..5cfc7656abe 100644
--- a/includes/admin/class-amp-editor-blocks.php
+++ b/includes/admin/class-amp-editor-blocks.php
@@ -138,6 +138,10 @@ public function enqueue_block_editor_assets() {
 				array( 'wp-editor', 'wp-blocks', 'lodash', 'wp-i18n', 'wp-element', 'wp-components' ),
 				AMP__VERSION
 			);
+
+			if ( function_exists( 'wp_set_script_translations' ) ) {
+				wp_set_script_translations( 'amp-editor-blocks-build', 'amp' );
+			}
 		}
 
 		wp_enqueue_script(
@@ -155,12 +159,16 @@ public function enqueue_block_editor_assets() {
 			) ) )
 		);
 
-		$locale_data = function_exists( 'wp_get_jed_locale_data' ) ? wp_get_jed_locale_data( 'amp' ) : gutenberg_get_jed_locale_data( 'amp' );
-		wp_add_inline_script(
-			'wp-i18n',
-			'wp.i18n.setLocaleData( ' . wp_json_encode( $locale_data ) . ', "amp" );',
-			'after'
-		);
+		if ( function_exists( 'wp_set_script_translations' ) ) {
+			wp_set_script_translations( 'amp-editor-blocks', 'amp' );
+		} elseif ( function_exists( 'wp_get_jed_locale_data' ) || function_exists( 'gutenberg_get_jed_locale_data' ) ) {
+			$locale_data = function_exists( 'wp_get_jed_locale_data' ) ? wp_get_jed_locale_data( 'amp' ) : gutenberg_get_jed_locale_data( 'amp' );
+			wp_add_inline_script(
+				'wp-i18n',
+				'wp.i18n.setLocaleData( ' . wp_json_encode( $locale_data ) . ', "amp" );',
+				'after'
+			);
+		}
 	}
 
 	/**
diff --git a/includes/admin/class-amp-post-meta-box.php b/includes/admin/class-amp-post-meta-box.php
index e4bb449da45..ba649356f6b 100644
--- a/includes/admin/class-amp-post-meta-box.php
+++ b/includes/admin/class-amp-post-meta-box.php
@@ -203,7 +203,13 @@ public function enqueue_block_assets() {
 			'errorMessages' => $error_messages,
 		);
 
-		$script_data['i18n'] = function_exists( 'wp_get_jed_locale_data' ) ? wp_get_jed_locale_data( 'amp' ) : gutenberg_get_jed_locale_data( 'amp' );
+		if ( function_exists( 'wp_set_script_translations' ) ) {
+			wp_set_script_translations( self::BLOCK_ASSET_HANDLE, 'amp' );
+		} elseif ( function_exists( 'wp_get_jed_locale_data' ) ) {
+			$script_data['i18n'] = wp_get_jed_locale_data( 'amp' );
+		} elseif ( function_exists( 'gutenberg_get_jed_locale_data' ) ) {
+			$script_data['i18n'] = gutenberg_get_jed_locale_data( 'amp' );
+		}
 
 		wp_add_inline_script(
 			self::BLOCK_ASSET_HANDLE,
diff --git a/includes/admin/functions.php b/includes/admin/functions.php
index eebef8554f2..5c9ed82939e 100644
--- a/includes/admin/functions.php
+++ b/includes/admin/functions.php
@@ -68,11 +68,13 @@ function amp_admin_get_preview_permalink() {
 	}
 
 	$post_ids = get_posts( array(
-		'post_status'    => 'publish',
-		'post_password'  => '',
-		'post_type'      => $supported_post_types,
-		'posts_per_page' => 1,
-		'fields'         => 'ids',
+		'no_found_rows'    => true,
+		'suppress_filters' => false,
+		'post_status'      => 'publish',
+		'post_password'    => '',
+		'post_type'        => $supported_post_types,
+		'posts_per_page'   => 1,
+		'fields'           => 'ids',
 		// @todo This should eventually do a meta_query to make sure there are none that have AMP_Post_Meta_Box::STATUS_POST_META_KEY = DISABLED_STATUS.
 	) );
 
diff --git a/includes/embeds/class-amp-gallery-embed.php b/includes/embeds/class-amp-gallery-embed.php
index a2c94ff3b7d..c2c481a8d06 100644
--- a/includes/embeds/class-amp-gallery-embed.php
+++ b/includes/embeds/class-amp-gallery-embed.php
@@ -17,6 +17,7 @@ class AMP_Gallery_Embed_Handler extends AMP_Base_Embed_Handler {
 	 */
 	public function register_embed() {
 		add_filter( 'post_gallery', array( $this, 'maybe_override_gallery' ), 10, 2 );
+		add_action( 'wp_print_styles', array( $this, 'print_styles' ) );
 	}
 
 	/**
@@ -160,6 +161,15 @@ public function maybe_override_gallery( $html, $attributes ) {
 			}
 
 			return $html;
+		} elseif ( isset( $attributes['size'] ) && 'thumbnail' === $attributes['size'] ) {
+			/*
+			 * If the 'gallery' shortcode has a 'size' attribute of 'thumbnail', prevent outputting an <amp-carousel>.
+			 * That will often get thumbnail images around 150 x 150,
+			 * while the <amp-carousel> usually has a width of 600 and a height of 480.
+			 * That often means very low-resolution images.
+			 * So fall back to the normal 'gallery' shortcode callback, gallery_shortcode().
+			 */
+			return '';
 		}
 		return $this->shortcode( $attributes );
 	}
@@ -224,4 +234,25 @@ public function render( $args ) {
 			implode( PHP_EOL, $images )
 		);
 	}
+
+	/**
+	 * Prints the Gallery block styling.
+	 *
+	 * It would be better to print this in AMP_Gallery_Block_Sanitizer,
+	 * but by the time that runs, it's too late.
+	 * This rule is copied exactly from block-library/style.css, but the selector here has amp-img >.
+	 * The image sanitizer normally converts the <img> from that original stylesheet <amp-img>,
+	 * but that doesn't have the same effect as applying it to the <img>.
+	 *
+	 * @return void
+	 */
+	public function print_styles() {
+		?>
+		<style>
+			.wp-block-gallery.is-cropped .blocks-gallery-item amp-img > img {
+				object-fit: cover;
+			}
+		</style>
+		<?php
+	}
 }
diff --git a/includes/sanitizers/class-amp-core-theme-sanitizer.php b/includes/sanitizers/class-amp-core-theme-sanitizer.php
index 1221d04e637..2e22faf4882 100644
--- a/includes/sanitizers/class-amp-core-theme-sanitizer.php
+++ b/includes/sanitizers/class-amp-core-theme-sanitizer.php
@@ -53,16 +53,20 @@ class AMP_Core_Theme_Sanitizer extends AMP_Base_Sanitizer {
 	protected static $theme_features = array(
 		// Twenty Nineteen.
 		'twentynineteen'  => array(
-			'dequeue_scripts' => array(
+			'dequeue_scripts'                             => array(
 				'twentynineteen-skip-link-focus-fix', // This is part of AMP. See <https://github.com/ampproject/amphtml/issues/18671>.
 				'twentynineteen-priority-menu',
 				'twentynineteen-touch-navigation', // @todo There could be an AMP implementation of this, similar to what is implemented on ampproject.org.
 			),
-			'remove_actions'  => array(
+			'remove_actions'                              => array(
 				'wp_print_footer_scripts' => array(
 					'twentynineteen_skip_link_focus_fix', // See <https://github.com/WordPress/twentynineteen/pull/47>.
 				),
 			),
+			'add_twentynineteen_masthead_styles'          => array(),
+			'add_twentynineteen_image_styles'             => array(),
+			'remove_twentynineteen_thumbnail_image_sizes' => array(),
+
 		),
 
 		// Twenty Seventeen.
@@ -340,6 +344,26 @@ public static function set_twentyseventeen_quotes_icon() {
 		} );
 	}
 
+	/**
+	 * Remove the sizes attribute from thumbnail images in Twenty Nineteen.
+	 *
+	 * The AMP runtime sets an inline style on an <amp-img> based on the sizes attribute if it's present.
+	 * For example, <amp-img style="width:calc(50vw)">.
+	 * Removing the 'sizes' attribute isn't ideal, but it looks like it's not possible to override that inline style.
+	 *
+	 * @todo: remove when this is resolved: https://github.com/ampproject/amphtml/issues/17053
+	 * @since 1.0
+	 */
+	public static function remove_twentynineteen_thumbnail_image_sizes() {
+		add_filter( 'wp_get_attachment_image_attributes', function( $attr ) {
+			if ( isset( $attr['class'] ) && false !== strpos( $attr['class'], 'attachment-post-thumbnail' ) ) {
+				unset( $attr['sizes'] );
+			}
+
+			return $attr;
+		}, 11 );
+	}
+
 	/**
 	 * Add filter to adjust the attachment image attributes to ensure attachment pages have a consistent <amp-img> rendering.
 	 *
@@ -526,6 +550,52 @@ protected static function get_twentyseventeen_navigation_outer_height() {
 		return 72;
 	}
 
+	/**
+	 * Add required styles for featured image header in Twenty Nineteen.
+	 *
+	 * The following is necessary because the styles in the theme apply to the featured img,
+	 * and the CSS parser will then convert the selectors to amp-img. Nevertheless, object-fit
+	 * does not apply on amp-img and it needs to apply on an actual img.
+	 *
+	 * @link https://github.com/WordPress/wordpress-develop/blob/5.0/src/wp-content/themes/twentynineteen/style.css#L2276-L2299
+	 * @since 1.0
+	 */
+	public static function add_twentynineteen_masthead_styles() {
+		add_action( 'wp_enqueue_scripts', function() {
+			ob_start();
+			?>
+			<style>
+			.site-header.featured-image .site-featured-image .post-thumbnail amp-img > img {
+				height: auto;
+				left: 50%;
+				max-width: 1000%;
+				min-height: 100%;
+				min-width: 100vw;
+				position: absolute;
+				top: 50%;
+				transform: translateX(-50%) translateY(-50%);
+				width: auto;
+				z-index: 1;
+				/* When image filters are active, make it grayscale to colorize it blue. */
+			}
+
+			@supports (object-fit: cover) {
+				.site-header.featured-image .site-featured-image .post-thumbnail amp-img > img {
+					height: 100%;
+					left: 0;
+					object-fit: cover;
+					top: 0;
+					transform: none;
+					width: 100%;
+				}
+			}
+			</style>
+			<?php
+			$styles = str_replace( array( '<style>', '</style>' ), '', ob_get_clean() );
+			wp_add_inline_style( get_template() . '-style', $styles );
+		}, 11 );
+	}
+
 	/**
 	 * Add required styles for video and image headers.
 	 *
@@ -1009,4 +1079,29 @@ public static function add_nav_sub_menu_buttons( $args = array() ) {
 			return $item_output;
 		}, 10, 4 );
 	}
+
+	/**
+	 * Output image styles for twentynineteen.
+	 *
+	 * When <img> tags have an 'aligncenter' class, AMP_Img_Sanitizer::handle_centering() wraps theme in <figure class="aligncenter">.
+	 * This ensures that the image inside it is centered.
+	 *
+	 * @since 1.0
+	 *
+	 * @param array $args Arguments.
+	 */
+	public static function add_twentynineteen_image_styles( $args = array() ) {
+		add_action( 'wp_enqueue_scripts', function() use ( $args ) {
+			ob_start();
+			?>
+			<style>
+				figure.aligncenter {
+					text-align: center
+				}
+			</style>
+			<?php
+			$styles = str_replace( array( '<style>', '</style>' ), '', ob_get_clean() );
+			wp_add_inline_style( get_template() . '-style', $styles );
+		}, 11 );
+	}
 }
diff --git a/includes/sanitizers/class-amp-form-sanitizer.php b/includes/sanitizers/class-amp-form-sanitizer.php
index 750bd88f85a..03babed13c5 100644
--- a/includes/sanitizers/class-amp-form-sanitizer.php
+++ b/includes/sanitizers/class-amp-form-sanitizer.php
@@ -24,6 +24,17 @@ class AMP_Form_Sanitizer extends AMP_Base_Sanitizer {
 	 */
 	public static $tag = 'form';
 
+	/**
+	 * Get mapping of HTML selectors to the AMP component selectors which they may be converted into.
+	 *
+	 * @return array Mapping.
+	 */
+	public function get_selector_conversion_mapping() {
+		return array(
+			'form' => array( 'amp-form' ),
+		);
+	}
+
 	/**
 	 * Sanitize the <form> elements from the HTML contained in this instance's DOMDocument.
 	 *
diff --git a/includes/sanitizers/class-amp-style-sanitizer.php b/includes/sanitizers/class-amp-style-sanitizer.php
index bf8f8416bc1..0ddb48b372a 100644
--- a/includes/sanitizers/class-amp-style-sanitizer.php
+++ b/includes/sanitizers/class-amp-style-sanitizer.php
@@ -1046,6 +1046,9 @@ private function prepare_stylesheet( $stylesheet_string, $options = array() ) {
 			$options
 		);
 
+		// Strip the dreaded UTF-8 byte order mark (BOM, \uFEFF). This should ideally get handled by PHP-CSS-Parser <https://github.com/sabberworm/PHP-CSS-Parser/issues/150>.
+		$stylesheet_string = preg_replace( '/^\xEF\xBB\xBF/', '', $stylesheet_string );
+
 		$stylesheet         = array();
 		$parsed_stylesheet  = $this->parse_stylesheet( $stylesheet_string, $options );
 		$validation_results = $parsed_stylesheet['validation_results'];
@@ -1979,13 +1982,17 @@ private function ampify_ruleset_selectors( $ruleset ) {
 				continue;
 			}
 
+			// An element (type) either starts a selector or is preceded by combinator, comma, opening paren, or closing brace.
+			$before_type_selector_pattern = '(?<=^|\(|\s|>|\+|~|,|})';
+			$after_type_selector_pattern  = '(?=$|[^a-zA-Z0-9_-])';
+
 			$edited_selectors = array( $selector );
 			foreach ( $this->selector_mappings as $html_selector => $amp_selectors ) { // Note: The $selector_mappings array contains ~6 items.
-				$html_pattern = '/(?<=^|[^a-z0-9_-])' . preg_quote( $html_selector, '/' ) . '(?=$|[^a-z0-9_-])/i';
+				$html_pattern = '/' . $before_type_selector_pattern . preg_quote( $html_selector, '/' ) . $after_type_selector_pattern . '/i';
 				foreach ( $edited_selectors as &$edited_selector ) { // Note: The $edited_selectors array contains only item in the normal case.
 					$original_selector = $edited_selector;
 					$amp_selector      = array_shift( $amp_selectors );
-					$amp_tag_pattern   = '/(?<=^|[^a-z0-9_-])' . preg_quote( $amp_selector, '/' ) . '(?=$|[^a-z0-9_-])/i';
+					$amp_tag_pattern   = '/' . $before_type_selector_pattern . preg_quote( $amp_selector, '/' ) . $after_type_selector_pattern . '/i';
 					preg_match( $amp_tag_pattern, $edited_selector, $matches );
 					if ( ! empty( $matches ) && $amp_selector === $matches[0] ) {
 						continue;
diff --git a/includes/validation/class-amp-validation-manager.php b/includes/validation/class-amp-validation-manager.php
index c4debbe27e0..2990fc82b18 100644
--- a/includes/validation/class-amp-validation-manager.php
+++ b/includes/validation/class-amp-validation-manager.php
@@ -1915,11 +1915,17 @@ public static function enqueue_block_validation() {
 			true
 		);
 
-		$data = wp_json_encode( array(
-			'i18n'                 => function_exists( 'wp_get_jed_locale_data' ) ? wp_get_jed_locale_data( 'amp' ) : gutenberg_get_jed_locale_data( 'amp' ),
+		$data = array(
 			'ampValidityRestField' => self::VALIDITY_REST_FIELD_NAME,
 			'isCanonical'          => amp_is_canonical(),
-		) );
-		wp_add_inline_script( $slug, sprintf( 'ampBlockValidation.boot( %s );', $data ) );
+		);
+
+		if ( function_exists( 'wp_set_script_translations' ) ) {
+			wp_set_script_translations( $slug, 'amp' );
+		} elseif ( function_exists( 'wp_get_jed_locale_data' ) || function_exists( 'gutenberg_get_jed_locale_data' ) ) {
+			$data['i18n'] = function_exists( 'wp_get_jed_locale_data' ) ? wp_get_jed_locale_data( 'amp' ) : gutenberg_get_jed_locale_data( 'amp' );
+		}
+
+		wp_add_inline_script( $slug, sprintf( 'ampBlockValidation.boot( %s );', wp_json_encode( $data ) ) );
 	}
 }
diff --git a/readme.md b/readme.md
index a4df05d524d..30be0c76b0e 100644
--- a/readme.md
+++ b/readme.md
@@ -7,7 +7,7 @@ Enable Accelerated Mobile Pages (AMP) on your WordPress site.
 **Contributors:** [batmoo](https://profiles.wordpress.org/batmoo), [joen](https://profiles.wordpress.org/joen), [automattic](https://profiles.wordpress.org/automattic), [potatomaster](https://profiles.wordpress.org/potatomaster), [albertomedina](https://profiles.wordpress.org/albertomedina), [google](https://profiles.wordpress.org/google), [xwp](https://profiles.wordpress.org/xwp), [westonruter](https://profiles.wordpress.org/westonruter)  
 **Tags:** [amp](https://wordpress.org/plugins/tags/amp), [mobile](https://wordpress.org/plugins/tags/mobile)  
 **Requires at least:** 4.7  
-**Tested up to:** 4.9  
+**Tested up to:** 5.0  
 **Stable tag:** 0.7.2  
 **License:** [GPLv2 or later](http://www.gnu.org/licenses/gpl-2.0.html)  
 **Requires PHP:** 5.3.6  
@@ -75,6 +75,7 @@ To learn how to use the new features in this release, please see the wiki pages
 - **Add support for allowing a site subset to be native AMP.** See [#1235](https://github.com/Automattic/amp-wp/pull/1235). Props westonruter.
 - Add an admin pointer for updated AMP settings screen for version 1.0. See [#1271](https://github.com/Automattic/amp-wp/pull/1271), [#1254](https://github.com/Automattic/amp-wp/issues/1254). Props kienstra.
 - Add support for three core themes (Twenty Fifteen, Twenty Sixteen, Twenty Seventeen) so that they can be used out of the box with AMP theme support added without needing to create a child theme. See [#1074](https://github.com/Automattic/amp-wp/pull/1074). Props westonruter, DavidCramer, kienstra.
+- Add AMP support for Twenty Nineteen. See [#1587](https://github.com/Automattic/amp-wp/pull/1587), [#1619](https://github.com/Automattic/amp-wp/pull/1619). Props westonruter.
 - Add AMP menu item to admin bar on frontend with indication of AMP validation status; accessing an AMP URL that has unaccepted validation errors will redirect to the non-AMP page and cause the AMP admin bar item to indicate the failure, along with a link to access the validation results. See [#1199](https://github.com/Automattic/amp-wp/pull/1199). Props westonruter.
 - Add dynamic handling of validation errors. See [#1093](https://github.com/Automattic/amp-wp/pull/1093), [#1063](https://github.com/Automattic/amp-wp/pull/1063), [#1087](https://github.com/Automattic/amp-wp/issues/1087). Props westonruter.
 - Add AMP validation of blocks. See [#1019](https://github.com/Automattic/amp-wp/pull/1019). Props westonruter.
@@ -147,20 +148,28 @@ To learn how to use the new features in this release, please see the wiki pages
 - Improve validation and presentation of analytics form. See [#1299](https://github.com/Automattic/amp-wp/pull/1299), [#1133](https://github.com/Automattic/amp-wp/issues/1133), [#1296](https://github.com/Automattic/amp-wp/pull/1296). Props westonruter, AdelDima.
 - Prevent validation of auto-drafts, including when merely accessing New Post screen. See [#1301](https://github.com/Automattic/amp-wp/pull/1301). Props westonruter.
 - Fix inability to move link element due to assigned parent. See [#1322](https://github.com/Automattic/amp-wp/issues/1322). Props westonruter.
+- Gutenberg: Remove 'type' from attributes where 'source' is set. See [#1622](https://github.com/Automattic/amp-wp/pull/1622). Props miina.
+- Gutenberg: Fix displaying validation warning and usage of PHP function. See [#1612](https://github.com/Automattic/amp-wp/pull/1612). Props miina.
 - Fix stretched images in Twenty Seventeen them and Gutenberg. See [#1321](https://github.com/Automattic/amp-wp/issues/1321), [#1281](https://github.com/Automattic/amp-wp/issues/1281), [#1237](https://github.com/Automattic/amp-wp/issues/1237). Props hellofromtonya.
 - Fix image dimension extractor so it does not disregard duplicate images. See [#1314](https://github.com/Automattic/amp-wp/issues/1314). Props lukas9393.
+- Short-circuit polldaddy shortcode when no poll or survey supplied. See [#1621](https://github.com/Automattic/amp-wp/pull/1621). Props westonruter.
 - Remove redundant version from composer.json and add PHP version requirement. See [#1333](https://github.com/Automattic/amp-wp/issues/1333), [#1328](https://github.com/Automattic/amp-wp/issues/1328), [#1334](https://github.com/Automattic/amp-wp/issues/1334), [#1332](https://github.com/Automattic/amp-wp/issues/1332). Props swissspidy.
+- Add warning when AMP plugin is installed in incorrect directory. See [#1593](https://github.com/Automattic/amp-wp/pull/1593). Props westonruter.
 - Store validation errors in order of occurrence in document. See [#1335](https://github.com/Automattic/amp-wp/issues/1335). Props westonruter.
 - Add .editorconfig file. See [#1336](https://github.com/Automattic/amp-wp/issues/1336), [#51](https://github.com/Automattic/amp-wp/issues/51). Props swissspidy.
 - Update i18n to make use of updated WP-CLI command. See [#1329](https://github.com/Automattic/amp-wp/issues/1329), [#1327](https://github.com/Automattic/amp-wp/issues/1327), [#1341](https://github.com/Automattic/amp-wp/issues/1341), [#1345](https://github.com/Automattic/amp-wp/issues/1345), [#1393](https://github.com/Automattic/amp-wp/issues/1393). Props swissspidy, felixarntz, westonruter.
 - Use all eligible post types when `all_templates_supported` is selected. See [#1338](https://github.com/Automattic/amp-wp/issues/1338), [#1302](https://github.com/Automattic/amp-wp/issues/1302), [#1344](https://github.com/Automattic/amp-wp/issues/1344). Props hellofromtonya, westonruter.
+- Do not show fallback source as active theme if no validation errors. See [#1592](https://github.com/Automattic/amp-wp/pull/1592). Props westonruter.
 - Respect default AMP enabled status when creating a new post in Gutenberg. See [#1339](https://github.com/Automattic/amp-wp/issues/1339). Props hellofromtonya.
 - Fix incorrect attribution of theme as source for content validation errors. See [#1467](https://github.com/Automattic/amp-wp/pull/1467). Props westonruter.
 - Fix conversion of video to amp-video. See [#1477](https://github.com/Automattic/amp-wp/pull/1477). Props westonruter.
 - Add new icon, text, and style to splash notice. See [#1470](https://github.com/Automattic/amp-wp/pull/1470). Props jacobschweitzer.
 - Normalize 'ver' query param in script/style validation errors to prevent recurrence after accepted. See [#1346](https://github.com/Automattic/amp-wp/issues/1346). Props westonruter.
+- Add bing-amp.com to the list of AMP Cache hosts. See [#1447](https://github.com/Automattic/amp-wp/pull/1447). Props westonruter.
 - Add missing tabindex attribute to lightbox images. See [#1350](https://github.com/Automattic/amp-wp/issues/1350). Props amedina.
+- Update AMP spec to 757 (v1811091519050). See [#1588](https://github.com/Automattic/amp-wp/pull/1588). Props westonruter, kienstra.
 - Detect ineffectual post-processor response cache due to high MISS rates and auto-disable. See [#1325](https://github.com/Automattic/amp-wp/issues/1325), [#1239](https://github.com/Automattic/amp-wp/issues/1239). Props hellofromtonya, westonruter.
+- Update regex for tag selectors. See [#1534](https://github.com/Automattic/amp-wp/pull/1534). Props swissspidy, westonruter.
 - Update the validator spec version to 720 and AMP v1534879991178; add support for reference points. See [#1315](https://github.com/Automattic/amp-wp/issues/1315), [#1386](https://github.com/Automattic/amp-wp/issues/1386), [#1330](https://github.com/Automattic/amp-wp/issues/1330). Props westonruter.
 - Update spec from revision 720 to 734. See [#1475](https://github.com/Automattic/amp-wp/pull/1475). Props kienstra.
 - Fix form sanitizer's handling of relative actions by making them absolute. See [#1352](https://github.com/Automattic/amp-wp/issues/1352), [#1349](https://github.com/Automattic/amp-wp/issues/1349). Props ricardobrg.
@@ -186,6 +195,7 @@ To learn how to use the new features in this release, please see the wiki pages
 - Improve access to AMP admin screens for users who are not administrators. [#1437](https://github.com/Automattic/amp-wp/pull/1437). Props westonruter.
 - Display a welcome notice on the main 'AMP Settings' page. See [#1442](https://github.com/Automattic/amp-wp/pull/1442). Props kienstra.
 - Fix URL protocol validation and parsing attribute values with multiple URLs. See [#1411](https://github.com/Automattic/amp-wp/pull/1411), [#1410](https://github.com/Automattic/amp-wp/issues/1410). Props westonruter.
+- Prevent a notice from appearing in the Compatibility Tool meta box. See [#1605](https://github.com/Automattic/amp-wp/pull/1605). Props kienstra.
 - Restore ability to customize 'amp' query var when theme support added. [#1455](https://github.com/Automattic/amp-wp/pull/1455). Props westonruter.
 - Add slug constants for theme support and post type support. [#1456](https://github.com/Automattic/amp-wp/pull/1456). Props westonruter.
 - Fix ability to add AMP support for custom post types. See [#1441](https://github.com/Automattic/amp-wp/pull/1441). Props westonruter.
diff --git a/readme.txt b/readme.txt
index df6a51b3e38..ee8e4e8957b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,7 +2,7 @@
 Contributors: batmoo, joen, automattic, potatomaster, albertomedina, google, xwp, westonruter
 Tags: amp, mobile
 Requires at least: 4.7
-Tested up to: 4.9
+Tested up to: 5.0
 Stable tag: 0.7.2
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
@@ -59,6 +59,7 @@ To learn how to use the new features in this release, please see the wiki pages
 - **Add support for allowing a site subset to be native AMP.** See [#1235](https://github.com/Automattic/amp-wp/pull/1235). Props westonruter.
 - Add an admin pointer for updated AMP settings screen for version 1.0. See [#1271](https://github.com/Automattic/amp-wp/pull/1271), [#1254](https://github.com/Automattic/amp-wp/issues/1254). Props kienstra.
 - Add support for three core themes (Twenty Fifteen, Twenty Sixteen, Twenty Seventeen) so that they can be used out of the box with AMP theme support added without needing to create a child theme. See [#1074](https://github.com/Automattic/amp-wp/pull/1074). Props westonruter, DavidCramer, kienstra.
+- Add AMP support for Twenty Nineteen. See [#1587](https://github.com/Automattic/amp-wp/pull/1587), [#1619](https://github.com/Automattic/amp-wp/pull/1619). Props westonruter.
 - Add AMP menu item to admin bar on frontend with indication of AMP validation status; accessing an AMP URL that has unaccepted validation errors will redirect to the non-AMP page and cause the AMP admin bar item to indicate the failure, along with a link to access the validation results. See [#1199](https://github.com/Automattic/amp-wp/pull/1199). Props westonruter.
 - Add dynamic handling of validation errors. See [#1093](https://github.com/Automattic/amp-wp/pull/1093), [#1063](https://github.com/Automattic/amp-wp/pull/1063), [#1087](https://github.com/Automattic/amp-wp/issues/1087). Props westonruter.
 - Add AMP validation of blocks. See [#1019](https://github.com/Automattic/amp-wp/pull/1019). Props westonruter.
@@ -131,20 +132,28 @@ To learn how to use the new features in this release, please see the wiki pages
 - Improve validation and presentation of analytics form. See [#1299](https://github.com/Automattic/amp-wp/pull/1299), [#1133](https://github.com/Automattic/amp-wp/issues/1133), [#1296](https://github.com/Automattic/amp-wp/pull/1296). Props westonruter, AdelDima.
 - Prevent validation of auto-drafts, including when merely accessing New Post screen. See [#1301](https://github.com/Automattic/amp-wp/pull/1301). Props westonruter.
 - Fix inability to move link element due to assigned parent. See [#1322](https://github.com/Automattic/amp-wp/issues/1322). Props westonruter.
+- Gutenberg: Remove 'type' from attributes where 'source' is set. See [#1622](https://github.com/Automattic/amp-wp/pull/1622). Props miina.
+- Gutenberg: Fix displaying validation warning and usage of PHP function. See [#1612](https://github.com/Automattic/amp-wp/pull/1612). Props miina.
 - Fix stretched images in Twenty Seventeen them and Gutenberg. See [#1321](https://github.com/Automattic/amp-wp/issues/1321), [#1281](https://github.com/Automattic/amp-wp/issues/1281), [#1237](https://github.com/Automattic/amp-wp/issues/1237). Props hellofromtonya.
 - Fix image dimension extractor so it does not disregard duplicate images. See [#1314](https://github.com/Automattic/amp-wp/issues/1314). Props lukas9393.
+- Short-circuit polldaddy shortcode when no poll or survey supplied. See [#1621](https://github.com/Automattic/amp-wp/pull/1621). Props westonruter.
 - Remove redundant version from composer.json and add PHP version requirement. See [#1333](https://github.com/Automattic/amp-wp/issues/1333), [#1328](https://github.com/Automattic/amp-wp/issues/1328), [#1334](https://github.com/Automattic/amp-wp/issues/1334), [#1332](https://github.com/Automattic/amp-wp/issues/1332). Props swissspidy.
+- Add warning when AMP plugin is installed in incorrect directory. See [#1593](https://github.com/Automattic/amp-wp/pull/1593). Props westonruter.
 - Store validation errors in order of occurrence in document. See [#1335](https://github.com/Automattic/amp-wp/issues/1335). Props westonruter.
 - Add .editorconfig file. See [#1336](https://github.com/Automattic/amp-wp/issues/1336), [#51](https://github.com/Automattic/amp-wp/issues/51). Props swissspidy.
 - Update i18n to make use of updated WP-CLI command. See [#1329](https://github.com/Automattic/amp-wp/issues/1329), [#1327](https://github.com/Automattic/amp-wp/issues/1327), [#1341](https://github.com/Automattic/amp-wp/issues/1341), [#1345](https://github.com/Automattic/amp-wp/issues/1345), [#1393](https://github.com/Automattic/amp-wp/issues/1393). Props swissspidy, felixarntz, westonruter.
 - Use all eligible post types when `all_templates_supported` is selected. See [#1338](https://github.com/Automattic/amp-wp/issues/1338), [#1302](https://github.com/Automattic/amp-wp/issues/1302), [#1344](https://github.com/Automattic/amp-wp/issues/1344). Props hellofromtonya, westonruter.
+- Do not show fallback source as active theme if no validation errors. See [#1592](https://github.com/Automattic/amp-wp/pull/1592). Props westonruter.
 - Respect default AMP enabled status when creating a new post in Gutenberg. See [#1339](https://github.com/Automattic/amp-wp/issues/1339). Props hellofromtonya.
 - Fix incorrect attribution of theme as source for content validation errors. See [#1467](https://github.com/Automattic/amp-wp/pull/1467). Props westonruter.
 - Fix conversion of video to amp-video. See [#1477](https://github.com/Automattic/amp-wp/pull/1477). Props westonruter.
 - Add new icon, text, and style to splash notice. See [#1470](https://github.com/Automattic/amp-wp/pull/1470). Props jacobschweitzer.
 - Normalize 'ver' query param in script/style validation errors to prevent recurrence after accepted. See [#1346](https://github.com/Automattic/amp-wp/issues/1346). Props westonruter.
+- Add bing-amp.com to the list of AMP Cache hosts. See [#1447](https://github.com/Automattic/amp-wp/pull/1447). Props westonruter.
 - Add missing tabindex attribute to lightbox images. See [#1350](https://github.com/Automattic/amp-wp/issues/1350). Props amedina.
+- Update AMP spec to 757 (v1811091519050). See [#1588](https://github.com/Automattic/amp-wp/pull/1588). Props westonruter, kienstra.
 - Detect ineffectual post-processor response cache due to high MISS rates and auto-disable. See [#1325](https://github.com/Automattic/amp-wp/issues/1325), [#1239](https://github.com/Automattic/amp-wp/issues/1239). Props hellofromtonya, westonruter.
+- Update regex for tag selectors. See [#1534](https://github.com/Automattic/amp-wp/pull/1534). Props swissspidy, westonruter.
 - Update the validator spec version to 720 and AMP v1534879991178; add support for reference points. See [#1315](https://github.com/Automattic/amp-wp/issues/1315), [#1386](https://github.com/Automattic/amp-wp/issues/1386), [#1330](https://github.com/Automattic/amp-wp/issues/1330). Props westonruter.
 - Update spec from revision 720 to 734. See [#1475](https://github.com/Automattic/amp-wp/pull/1475). Props kienstra.
 - Fix form sanitizer's handling of relative actions by making them absolute. See [#1352](https://github.com/Automattic/amp-wp/issues/1352), [#1349](https://github.com/Automattic/amp-wp/issues/1349). Props ricardobrg.
@@ -170,6 +179,7 @@ To learn how to use the new features in this release, please see the wiki pages
 - Improve access to AMP admin screens for users who are not administrators. [#1437](https://github.com/Automattic/amp-wp/pull/1437). Props westonruter.
 - Display a welcome notice on the main 'AMP Settings' page. See [#1442](https://github.com/Automattic/amp-wp/pull/1442). Props kienstra.
 - Fix URL protocol validation and parsing attribute values with multiple URLs. See [#1411](https://github.com/Automattic/amp-wp/pull/1411), [#1410](https://github.com/Automattic/amp-wp/issues/1410). Props westonruter.
+- Prevent a notice from appearing in the Compatibility Tool meta box. See [#1605](https://github.com/Automattic/amp-wp/pull/1605). Props kienstra.
 - Restore ability to customize 'amp' query var when theme support added. [#1455](https://github.com/Automattic/amp-wp/pull/1455). Props westonruter.
 - Add slug constants for theme support and post type support. [#1456](https://github.com/Automattic/amp-wp/pull/1456). Props westonruter.
 - Fix ability to add AMP support for custom post types. See [#1441](https://github.com/Automattic/amp-wp/pull/1441). Props westonruter.
diff --git a/tests/test-amp-style-sanitizer.php b/tests/test-amp-style-sanitizer.php
index 66bddb41e0b..8105e3abc28 100644
--- a/tests/test-amp-style-sanitizer.php
+++ b/tests/test-amp-style-sanitizer.php
@@ -502,6 +502,11 @@ public function get_amp_selector_data() {
 				'span {color:red;} @keyframes foo { from: { opacity:0; } 50% {opacity:0.5} 75%,80% { opacity:0.6 } to { opacity:1 }  }',
 				'@keyframes foo{from:{opacity:0}50%{opacity:.5}75%,80%{opacity:.6}to{opacity:1}}',
 			),
+			'type_class_names' => array(
+				'<audio src="https://example.org/foo.mp3" width="100" height="100" class="audio iframe video img form">',
+				'.video{color:blue;} audio.audio{color:purple;} .iframe{color:black;} .img{color:purple;} .form:not(form){color:green;}',
+				'.video{color:blue}amp-audio.audio{color:purple}.iframe{color:black}.img{color:purple}.form:not(amp-form){color:green}',
+			),
 		);
 	}
 
diff --git a/tests/test-class-amp-meta-box.php b/tests/test-class-amp-meta-box.php
index 5f386a9f14a..0e204e578e4 100644
--- a/tests/test-class-amp-meta-box.php
+++ b/tests/test-class-amp-meta-box.php
@@ -77,8 +77,8 @@ public function test_enqueue_admin_assets() {
 	 * @see AMP_Post_Meta_Box::enqueue_block_assets()
 	 */
 	public function test_enqueue_block_assets() {
-		if ( ! function_exists( 'wp_get_jed_locale_data' ) && ! function_exists( 'gutenberg_get_jed_locale_data' ) ) {
-			$this->markTestSkipped( 'Gutenberg is not available' );
+		if ( ! function_exists( 'register_block_type' ) ) {
+			$this->markTestSkipped( 'The block editor is not available' );
 		}
 
 		// If a post type doesn't have AMP enabled, the script shouldn't be enqueued.
diff --git a/tests/validation/test-class-amp-validation-manager.php b/tests/validation/test-class-amp-validation-manager.php
index 671e6fa13f5..4a6f2917b78 100644
--- a/tests/validation/test-class-amp-validation-manager.php
+++ b/tests/validation/test-class-amp-validation-manager.php
@@ -668,9 +668,9 @@ public function get_block_data() {
 				),
 			),
 			'latest_posts' => array(
-				'<!-- wp:latest-posts {"postsToShow":1} /-->',
+				'<!-- wp:latest-posts {"postsToShow":1,"categories":""} /-->',
 				sprintf(
-					'<!--amp-source-stack {"block_name":"core\/latest-posts","post_id":{{post_id}},"block_content_index":0,"block_attrs":{"postsToShow":1},"type":"%1$s","name":"%2$s","function":"render_block_core_latest_posts"}--><ul class="wp-block-latest-posts"><li><a href="{{url}}">{{title}}</a></li></ul><!--/amp-source-stack {"block_name":"core\/latest-posts","post_id":{{post_id}},"block_attrs":{"postsToShow":1},"type":"%1$s","name":"%2$s","function":"render_block_core_latest_posts"}-->',
+					'<!--amp-source-stack {"block_name":"core\/latest-posts","post_id":{{post_id}},"block_content_index":0,"block_attrs":{"postsToShow":1,"categories":""},"type":"%1$s","name":"%2$s","function":"render_block_core_latest_posts"}--><ul class="wp-block-latest-posts"><li><a href="{{url}}">{{title}}</a></li></ul><!--/amp-source-stack {"block_name":"core\/latest-posts","post_id":{{post_id}},"block_attrs":{"postsToShow":1,"categories":""},"type":"%1$s","name":"%2$s","function":"render_block_core_latest_posts"}-->',
 					function_exists( 'gutenberg_wpautop' ) ? 'plugin' : 'core',
 					function_exists( 'gutenberg_wpautop' ) ? 'gutenberg' : 'wp-includes'
 				),
@@ -1282,8 +1282,8 @@ public function test_print_plugin_notice() {
 	 * @covers AMP_Validation_Manager::enqueue_block_validation()
 	 */
 	public function test_enqueue_block_validation() {
-		if ( ! function_exists( 'gutenberg_get_jed_locale_data' ) ) {
-			$this->markTestSkipped( 'Gutenberg not available.' );
+		if ( ! function_exists( 'register_block_type' ) ) {
+			$this->markTestSkipped( 'The block editor is not available.' );
 		}
 
 		global $post;
@@ -1292,15 +1292,19 @@ public function test_enqueue_block_validation() {
 		$this->set_capability();
 		AMP_Validation_Manager::enqueue_block_validation();
 
-		$script        = wp_scripts()->registered[ $slug ];
-		$inline_script = $script->extra['after'][1];
+		$script                = wp_scripts()->registered[ $slug ];
+		$inline_script         = $script->extra['after'][1];
+		$expected_dependencies = array( 'underscore', AMP_Post_Meta_Box::BLOCK_ASSET_HANDLE );
+		if ( function_exists( 'wp_set_script_translations' ) ) {
+			$expected_dependencies[] = 'wp-i18n';
+		}
+
 		$this->assertContains( 'js/amp-block-validation.js', $script->src );
-		$this->assertEqualSets( array( 'underscore', AMP_Post_Meta_Box::BLOCK_ASSET_HANDLE ), $script->deps );
+		$this->assertEqualSets( $expected_dependencies, $script->deps );
 		$this->assertEquals( AMP__VERSION, $script->ver );
 		$this->assertTrue( in_array( $slug, wp_scripts()->queue, true ) );
 		$this->assertContains( 'ampBlockValidation.boot', $inline_script );
 		$this->assertContains( AMP_Validation_Manager::VALIDITY_REST_FIELD_NAME, $inline_script );
-		$this->assertContains( '"domain":"amp"', $inline_script );
 	}
 
 	/**
diff --git a/wpcom/class-amp-polldaddy-embed.php b/wpcom/class-amp-polldaddy-embed.php
index 9220dff4dbf..f0696641363 100644
--- a/wpcom/class-amp-polldaddy-embed.php
+++ b/wpcom/class-amp-polldaddy-embed.php
@@ -36,17 +36,21 @@ public function unregister_embed() {
 	public function shortcode( $attr ) {
 		global $wp_embed;
 
-		$output = '';
-		$url    = 'https://polldaddy.com/';
+		$url = null;
 		if ( ! empty( $attr['poll'] ) ) {
-			$url .= 'poll/' . $attr['poll'] . '/';
+			$url = 'https://polldaddy.com/poll/' . $attr['poll'] . '/';
 		} elseif ( ! empty( $attr['survey'] ) ) {
-			$url .= 's/' . $attr['survey'] . '/';
+			$url = 'https://polldaddy.com/s/' . $attr['survey'] . '/';
+		}
+
+		// Short-circuit in the case of the ratings embed.
+		if ( ! $url ) {
+			return '';
 		}
 
 		if ( ! empty( $attr['title'] ) ) {
 			$output = $this->render_link( $url, $attr['title'] );
-		} elseif ( $url ) {
+		} else {
 			$output = $wp_embed->shortcode( $attr, $url );
 		}