I setup a simple jsfiddle page to display what I am looking to do.
<input title="I want this message to display whatever text is in the input field."></input>
When you hover over the input field then the title is displayed: "I want this message to display whatever text is in the input field."
I want this hover message to display whatever the user has entered into the actual input field.
So if a user has entered https://stackoverflow.com/ into the input field, I want the hover message (title) to display https://stackoverflow.com/