TOPIC: Front Submission Error/Tooltip

Hello,
I can't seem to find how to manipulate the error messaging, and css design of it. Since I cannot catch it using firebug etc..
Here is a screenshot:
http://prntscr.com/9pjihm
I want to see the html structure to apply different css on it, and I might need to change the errors themselves.

Thanks

That is html5 validation. It's made by your browser. You can sort of style it but it's complicated. developer.telerik.com/featured/building-...bubble-replacements/

I wasn't familiar with those.. )) Thanks. So why do those fire up at all? bootstrap? Or just because class "invalid" is added?

because of the required tag on the field:
developer.mozilla.org/en-US/docs/Web/Gui...Data_form_validation