iOS 10 should be served javascript_version:es5 (#11387)

* iOS 10 should be served javascript_version:es5

Fixes #11234

* Update min Safari version to 12

homeassistant/components/frontend/__init__.py

@@ -582,9 +582,10 @@ def _is_latest(js_option, request):
     from user_agents import parse
     useragent = parse(request.headers.get('User-Agent'))
 
-    # on iOS every browser is a Safari which we support from version 10.
+    # on iOS every browser is a Safari which we support from version 11.
     if useragent.os.family == 'iOS':
-        return useragent.os.version[0] >= 10
+        # Was >= 10, temp setting it to 12 to work around issue #11387
+        return useragent.os.version[0] >= 12
 
     family_min_version = {
         'Chrome': 50,   # Probably can reduce this