Apply new error taxonomy page design

assets/css/amp-validation-error-taxonomy.css

@@ -0,0 +1,138 @@
+#col-left {
+	display: none;
+}
+#col-right {
+	float: none;
+	width: auto;
+}
+
+/* Improve column widths */
+td.column-details pre,
+td.column-sources pre {
+	overflow: auto;
+}
+
+th.column-created_date_gmt,
+th.column-error_type {
+	width: 15%;
+}
+
+th.column-status {
+	width: 10%;
+}
+
+.fixed th.column-posts {
+	width: 10%;
+}
+
+/* Details column */
+.details-attributes__summary {
+	display: flex;
+	justify-content: space-between;
+	align-items: center;
+}
+
+details[open] .details-attributes__summary {
+	font-weight: 600;
+	margin-bottom: 15px;
+}
+
+.details-attributes__summary::-webkit-details-marker {
+	display: none;
+}
+
+.details-attributes__summary::after {
+	order: 99;
+	width: 12px;
+	height: 12px;
+	background-image: url("../images/down-triangle.svg");
+	background-size: cover;
+	background-position: center;
+	content: "";
+}
+
+details[open] .details-attributes__summary::after {
+	transform: rotate(180deg);
+}
+
+.details-attributes__title,
+.details-attributes__attr {
+	color: #dc3232;
+}
+
+.details-attributes__list {
+	margin-top: 0;
+	padding-left: 45px;
+	list-style-type: disc;
+}
+
+.details-attributes__list li {
+	word-break: break-all;
+}
+
+.details-attributes__value {
+	color: #00a0d2;
+}
+
+/* Error details toggle button */
+.manage-column.column-details {
+	display: flex;
+	justify-content: space-between;
+	align-items: center;
+}
+
+.error-details-toggle {
+	display: flex;
+	flex-direction: column;
+	height: 12px;
+	margin-right: 10px;
+	padding: 0;
+	background: none;
+	border: none;
+	cursor: pointer;
+}
+
+.error-details-toggle.is-open {
+	transform: rotate(180deg);
+}
+
+.error-details-toggle::before,
+.error-details-toggle::after {
+	width: 12px;
+	height: 12px;
+	background-image: url("../images/down-triangle.svg");
+	background-size: cover;
+	background-position: center;
+	content: "";
+}
+
+/* Status text icons */
+.status-text {
+	display: flex;
+	align-items: center;
+}
+
+.status-text::before {
+	margin-right: 10px;
+	background-size: 20px 20px;
+	height: 20px;
+	width: 20px;
+	content: "";
+}
+
+.status-text.sanitized::before {
+	background-image: url( '../images/amp-logo-icon.svg' );
+}
+
+.status-text.new::before {
+	background-image: url( '../images/baseline-error.svg' );
+}
+
+.status-text.accepted::before {
+	background-image: url( '../images/baseline-check-circle-green.svg' );
+}
+
+.status-text.rejected::before {
+	background-image: url( '../images/baseline-error-blue.svg' );
+}
+

assets/src/amp-validation-error-detail-toggle.js

@@ -0,0 +1,60 @@
+/**
+ * WordPress dependencies
+ */
+import domReady from '@wordpress/dom-ready';
+
+/**
+ * Localized data
+ */
+import { btnAriaLabel } from 'amp-validation-i18n';
+
+const OPEN_CLASS = 'is-open';
+
+/**
+ * Adds detail toggle buttons to the header and footer rows of the validation error "details" column.
+ * The buttons are added via JS because there's no easy way to append them to the heading of a sortable
+ * table column via backend code.
+ */
+function addToggleButtons() {
+	[ ...document.querySelectorAll( 'th.column-details.manage-column' ) ].forEach( th => {
+		const button = document.createElement( 'button' );
+		button.setAttribute( 'aria-label', btnAriaLabel );
+		button.setAttribute( 'type', 'button' );
+		button.setAttribute( 'class', 'error-details-toggle' );
+		th.appendChild( button );
+	} );
+}
+
+/**
+ * Adds a listener toggling all details in the error type taxonomy details column.
+ */
+function addToggleListener() {
+	let open = false;
+
+	const details = [ ...document.querySelectorAll( '.column-details details' ) ];
+	const toggleButtons = [ ...document.querySelectorAll( 'button.error-details-toggle' ) ];
+	const onButtonClick = () => {
+		open = ! open;
+		toggleButtons.forEach( btn => {
+			btn.classList.toggle( OPEN_CLASS );
+		} );
+		details.forEach( detail => {
+			if ( open ) {
+				detail.setAttribute( 'open', true );
+			} else {
+				detail.removeAttribute( 'open' );
+			}
+		} );
+	};
+
+	window.addEventListener( 'click', event => {
+		if ( toggleButtons.includes( event.target ) ) {
+			onButtonClick();
+		}
+	} );
+}
+
+domReady( () => {
+	addToggleButtons();
+	addToggleListener();
+} );

includes/sanitizers/class-amp-style-sanitizer.php

@@ -32,6 +32,13 @@ class AMP_Style_Sanitizer extends AMP_Base_Sanitizer {
 	 */
 	const TREE_SHAKING_ERROR_CODE = 'removed_unused_css_rules';
 
+	/**
+	 * Error code for illegal at-rule.
+	 *
+	 * @var string
+	 */
+	const ILLEGAL_AT_RULE_ERROR_CODE = 'illegal_css_at_rule';
+
 	/**
 	 * Inline style selector's specificity multiplier, i.e. used to generate the number of ':not(#_)' placeholders.
 	 *
@@ -233,7 +240,7 @@ public static function get_css_parser_validation_error_codes() {
 		return array(
 			'css_parse_error',
 			'excessive_css',
-			'illegal_css_at_rule',
+			self::ILLEGAL_AT_RULE_ERROR_CODE,
 			'illegal_css_important',
 			'illegal_css_property',
 			self::TREE_SHAKING_ERROR_CODE,
@@ -1243,7 +1250,7 @@ private function process_css_list( CSSList $css_list, $options ) {
 			} elseif ( $css_item instanceof AtRuleBlockList ) {
 				if ( ! in_array( $css_item->atRuleName(), $options['allowed_at_rules'], true ) ) {
 					$error     = array(
-						'code'    => 'illegal_css_at_rule',
+						'code'    => self::ILLEGAL_AT_RULE_ERROR_CODE,
 						'at_rule' => $css_item->atRuleName(),
 						'type'    => AMP_Validation_Error_Taxonomy::CSS_ERROR_TYPE,
 					);
@@ -1264,7 +1271,7 @@ private function process_css_list( CSSList $css_list, $options ) {
 			} elseif ( $css_item instanceof AtRuleSet ) {
 				if ( ! in_array( $css_item->atRuleName(), $options['allowed_at_rules'], true ) ) {
 					$error     = array(
-						'code'    => 'illegal_css_at_rule',
+						'code'    => self::ILLEGAL_AT_RULE_ERROR_CODE,
 						'at_rule' => $css_item->atRuleName(),
 						'type'    => AMP_Validation_Error_Taxonomy::CSS_ERROR_TYPE,
 					);
@@ -1281,7 +1288,7 @@ private function process_css_list( CSSList $css_list, $options ) {
 			} elseif ( $css_item instanceof KeyFrame ) {
 				if ( ! in_array( 'keyframes', $options['allowed_at_rules'], true ) ) {
 					$error     = array(
-						'code'    => 'illegal_css_at_rule',
+						'code'    => self::ILLEGAL_AT_RULE_ERROR_CODE,
 						'at_rule' => $css_item->atRuleName(),
 						'type'    => AMP_Validation_Error_Taxonomy::CSS_ERROR_TYPE,
 					);
@@ -1297,7 +1304,7 @@ private function process_css_list( CSSList $css_list, $options ) {
 				}
 			} elseif ( $css_item instanceof AtRule ) {
 				$error     = array(
-					'code'    => 'illegal_css_at_rule',
+					'code'    => self::ILLEGAL_AT_RULE_ERROR_CODE,
 					'at_rule' => $css_item->atRuleName(),
 					'type'    => AMP_Validation_Error_Taxonomy::CSS_ERROR_TYPE,
 				);