Off-screen mandatory empty variables are not focused or scrolled to when "Submit"/"Order Now" button is clicked in Service Catalog.

The issue occurs on some of the variable types, namely:
Checkbox
Duration
HTML
Label
List Collector
Masked
Reference

1. Create four variables of type "Single Line Text" on a test catalog item with the following details:
   Name: Test1, Order: 100
   Name: Test2, Order: 200
   Name: Test3, Order: 300
   Name: Test4, Order: 400 (Set Mandatory Checkbox to true).
   
   
2. Open this test item in Service Catalog and resize the browser window such that Test4 variable is hidden (accessible via scrolling down) but "Order Now" / "Submit" button is visible. You can create more variables in order to make that mandatory variable hidden somehow.
   
   
3. Click "Order Now" / "Submit" button and notice the browser window scrolls down to focus on the Test4 variable.
   
   
4. Change the Test4 variable type to one of the mentioned types below, with mandatory as true:
   Checkbox
   Duration
   HTML
   Label
   List Collector
   Masked
   Reference
   
   Notice the browser does not scroll to focus in this cases.
   

This is the expected behavior. By design some fields types do auto-scroll to the empty mandatory variable, and some do not, such as HTML, Reference, and the others listed.