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I accessed this webpage using Safari on iPad (iOS 12.1.1) and here's the screenshot for Vote to Close button for the said scenarios.
Please comment to pin-point to the specific issue or if you are encountering a different one.
In the above case, the Vote to Close button is disabled. It will get enabled once you start typing anything past "... off-topic ...
Only top voted, non community-wiki answers of a minimum length are eligible