Tests that the value of the svh unit can be overridden.
Initial state:
Difference between 100lvh and 100svh: 0
Overriding small viewport height
Difference between 100lvh and 100svh: 10
Reloading
Difference between 100lvh and 100svh: 10
Unsetting override
Difference between 100lvh and 100svh: 0
Overriding and navigating cross-origin
Difference between 100lvh and 100svh: 10