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<!DOCTYPE html> <html> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script> <style> form.ng-pristine { background-color:lightblue; } form.ng-dirty { background-color:pink; } </style> <body ng-app=""> <form name="myForm"> <p>Try writing in the input field:</p> <input name="myName" ng-model="myName" required> <p>The form gets a "ng-dirty" class when the form has been modified, and will therefore turn pink.</p> </form> </body> </html>
