Password managers have become an integral part of today's web browsers. They are able to determine whether the form is a login form and fill it out accordingly. However, some ugly JavaScript can confuse them and interfere with their functionality, thus breaking it.
In fact, I found two sites where I was unable to use password manager built in my Opera web browser because it was not recognizing login or password field properly due to underlying JS hocus-pocus. Firefox and Google Chrome did not even propose password saving at all. What is more, such complication may also make it impossible to submit the form using the enter key and hence require user to explicitly click on the submit button.
Advice: Do not try to be smarter than the already existing solutions by reinventing functionality of the login forms. Or at least if you have a very good reason to do this make sure that you don't break those solutions (including password managers).
Observed at: Parallels Plesk Control Panel at netarteria.pl and website of my company's business partner.
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