fix: Bug 1459547, add pa11y for automated local a11y testing

.eslintrc.js

@@ -1,8 +1,12 @@
 module.exports = {
     'env': {
         'browser': true,
+        'es6': true,
         'jquery': true
     },
+    parserOptions: {
+        ecmaVersion: 8
+    },
     'extends': 'eslint:recommended',
     'rules': {
         'no-global-assign': 'error',
@@ -62,6 +66,7 @@ module.exports = {
         'Mozilla': true,
         'waffle': true,
         'Prism': true,
-        'Promise': true
+        'Promise': true,
+        'require': true
     }
 };

.gitignore

@@ -73,6 +73,7 @@ mdn_sample_db.sql.gz
 node_modules/
 /static/
 /tmp/emails/*.log
+pa11y-results
 
 # Selenium
 geckodriver.log

.pa11y

@@ -0,0 +1,11 @@
+{
+    "urls": [
+        "http://localhost:8000/",
+        "http://localhost:8000/en-US/docs/Web/HTML",
+        "http://localhost:8000/en-US/docs/Learn",
+        "http://localhost:8000/en-US/docs/Web/Guide",
+        "http://localhost:8000/en-US/docs/MDN/Feedback",
+        "http://localhost:8000/en-US/docs/Web/JavaScript",
+        "http://localhost:8000/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat"
+    ]
+}

.pa11yci-prod

@@ -0,0 +1,14 @@
+{
+    "defaults": {
+        "timeout": 1500,
+    },
+    "urls": [
+        "https://developer.mozilla.org/",
+        "https://developer.mozilla.org/en-US/docs/Web/HTML",
+        "https://developer.mozilla.org/en-US/docs/Learn",
+        "https://developer.mozilla.org/en-US/docs/Web/Guide",
+        "https://developer.mozilla.org/en-US/docs/MDN/Feedback",
+        "https://developer.mozilla.org/en-US/docs/Web/JavaScript",
+        "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat"
+    ]
+}