click: "input#line-numbers"
wait-for: 100 // wait-for-false does not exist
assert-false: "pre.example-line-numbers"
+assert-local-storage: {"rustdoc-line-numbers": "false" }
// Finally, turn it on again.
click: "input#line-numbers"
wait-for: "pre.example-line-numbers"
+assert-local-storage: {"rustdoc-line-numbers": "true" }