Mouseover inputbox's remembered value will close the nav

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I created a login form in the dropdown nav. When we remember and save the login credential in browser. Then, I mouseover to the nav, it show dropdown nav properly. However, when I click and select the inputbox's remembered value, the nav will close despite my mouse cursor is still within the dropdown nav. This happen in Firefox and Chrome. I put data-delay to make the nav close slowly and less obvious. Hope there is better solution for this issue. Thanks.