Problems disabling browser back button

I configured the survey settings to disable both the previous button and the browser back button, but the disable setting is not working for the browser back button. I've tested the survey on multiple browsers, but I am still able to work the browser back button. (I understand that this feature doesn't work on all browsers)

For most of the survey, this is not a big deal, but I have an unaided recall question where it is important to disable this feature. Is there something that I can do for this particular question (or the survey itself)?

Thanks,
Debra

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