[asp.net + bootstrap] Email field點可以有個Ballon

當個email invalid 時,想出個ballon
以前有個Theme,佢包埋個Email input type class
會出到ballon,但現在換左Theme
唔知點用Bootstrap 整番出來...
THX

個Balloon好似係browser先帶
type="email"就自己會識出
http://www.w3schools.com/html/tr ... tryhtml_input_email

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