Add a couple of ignoreTypes, many more to follow

.stylelintrc.json

@@ -3,6 +3,15 @@
  "rules": {
     "declaration-block-no-redundant-longhand-properties": null,
     "declaration-block-single-line-max-declarations": null,
-    "length-zero-no-unit": null
+    "length-zero-no-unit": null,
+
+    "selector-type-no-unknown": [true, {
+      "ignoreTypes": [
+        "author",
+        "date",
+        "description",
+        "genre"
+      ]
+}]
  }
 }