Steps to replicate the issue (include links if applicable):

• Have the rollback right and go to a Wikipedia page on a phone using the normal Minerva skin with the default setting that asks for confirmation when using rollback
• Attempt to rollback an edit using the normal rollback button on the page history
• When it asks for confirmation, cancel the rollback

What happens?:
The edit is rolled back no matter which option you choose in the confirmation prompt. Even when attempting to cancel the use of rollback, it reverts the edit anyways.

What should have happened instead?:
The rollback is cancelled and no edit is made.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):
Using safari on iPhone with mobile webpage.