Used for testing the css_diff check type. Nothing here is dynamic — every element below only changes when you edit this file by hand and re-upload it, which is exactly the point for the manual transition tests.
Selector: .test-price
Selector: .test-removable — used for the "selector stops
matching" / "selector matches again" test. Delete the div below entirely
(not just its content) to trigger "not_found", then put it back to
trigger "found_again".