old_contents: from seleniumbase import BaseCase
  
  
  class VisualLayoutTest(BaseCase):
  
      def test_applitools_helloworld(self):
          self.open('https://applitools.com/helloworld?diff1')
          print('Creating baseline in "visual_baseline" folder...')
          self.check_window(name="helloworld", baseline=True)
          self.click('a[href="?diff1"]')
          # Verify html tags match previous version
          self.check_window(name="helloworld", level=1)
          # Verify html tags + attributes match previous version
          self.check_window(name="helloworld", level=2)
          # Verify html tags + attributes + values match previous version
          self.check_window(name="helloworld", level=3)
          # Change the page enough for a Level-3 comparison to fail
          self.click("button")
          self.check_window(name="helloworld", level=1)
          self.check_window(name="helloworld", level=2)
          with self.assertRaises(Exception):
              self.check_window(name="helloworld", level=3)
          # Now that we know the exception was raised as expected,
          # let's print out the comparison results by running in Level-0.
          self.check_window(name="helloworld", level=0)
  
new_contents: from seleniumbase import BaseCase
  
  
  class VisualLayoutTest(BaseCase):
  
      def test_applitools_helloworld(self):
          self.open('https://applitools.com/helloworld?diff1')
          print('Creating baseline in "visual_baseline" folder...')
          self.check_window(name="helloworld", baseline=True)
          self.click('a[href="?diff1"]')
          # Verify html tags match previous version
          self.check_window(name="helloworld", level=1)
          # Verify html tags + attributes match previous version
          self.check_window(name="helloworld", level=2)
          # Verify html tags + attributes + values match previous version
          self.check_window(name="helloworld", level=3)
          # Change the page enough for a Level-3 comparison to fail
          self.click("button")
          self.check_window(name="helloworld", level=1)
          self.check_window(name="helloworld", level=2)
          with self.assertRaises(Exception):
              self.check_window(name="helloworld", level=3)
          # Now that we know the Exception was raised as expected,
          # let's print out the comparison results by running in Level-0.
          # (NOTE: Running with level-0 will print but NOT raise an Exception.)
          self.check_window(name="helloworld", level=0)
  
subject: Update comments in the layout test