FIX: We don't need support for `rows` or `cols` in `textarea`.

app/assets/javascripts/defer/html-sanitizer-bundle.js

@@ -989,7 +989,6 @@ html4.ATTRIBS = {
   'source::type': 0,
   'textarea::accesskey': 0,
   'textarea::autocomplete': 0,
-  'textarea::cols': 0,
   'textarea::disabled': 0,
   'textarea::inputmode': 0,
   'textarea::name': 8,
@@ -999,8 +998,6 @@ html4.ATTRIBS = {
   'textarea::onselect': 2,
   'textarea::placeholder': 0,
   'textarea::readonly': 0,
-  'textarea::required': 0,
-  'textarea::rows': 0,
   'textarea::tabindex': 0,
   'textarea::wrap': 0,
   'track::default': 0,