ci(docs-infra): run a11y audits on certain pages on CI (#31414)

PR Close #31414

aio/scripts/test-aio-a11y.js

@@ -0,0 +1,38 @@
+#!/bin/env node
+'use strict';
+
+/**
+ * Usage:
+ * ```sh
+ * node scripts/test-aio-a11y <origin>
+ * ```
+ *
+ * Runs accessibility audits on several (pre-defined) pages on the specified origin. It fails, if
+ * the score for any page is below the minimum (see `MIN_SCORES_PER_PAGE` below).
+ *
+ * `<origin>` is the origin (scheme + hostname + port) of an angular.io deployment. It can be remote
+ * (e.g. `https://next.angular.io`) or local (e.g. `http://localhost:4200`).
+ */
+
+// Imports
+const sh = require('shelljs');
+sh.set('-e');
+
+// Constants
+const MIN_SCORES_PER_PAGE = {
+  '': 100,
+  'api': 90,
+  'api/core/Directive': 90,
+  'cli': 91,
+  'cli/add': 91,
+  'docs': 100,
+  'guide/docs-style-guide': 88,
+  'start': 90,
+};
+
+// Run
+const auditWebAppCmd = `"${process.execPath}" "${__dirname}/audit-web-app"`;
+const origin = process.argv[2];
+for (const [page, minScore] of Object.entries(MIN_SCORES_PER_PAGE)) {
+  sh.exec(`${auditWebAppCmd} ${origin}/${page} accessibility:${minScore}`);
+}