Why is Chrome showing a "Please Fill Out this Field" tooltip on empty fields?
Are you using the HTML5 required attribute?
That will cause Chrome 10 to display a balloon prompting the user to fill out the field.
https://www.w3.org/TR/html5/sec-forms.html#element-attrdef-form-novalidate
You can disable the validation in the form.
Put novalidate="novalidate"
on <form>
tag.
<form novalidate="novalidate">...</form>
In XHTML, attribute minimization is forbidden, and the novalidate attribute must be defined as
<form novalidate="novalidate">
.