Ensure that the username field has the input focus in the login form so that it's easier for users to quickly log in

From the mailing list (from Mohails):

Hi!

It's quite good when the login form appears to set the automatic
focus on the username field. Maybe this feature could be included in
XWiki as a standart.
All you need is to paste this script after the login form:

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document.forms.loginForm.j_username.focus();

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