Angular binding with form automatically - html

Question

jsfiddle demo: https://jsfiddle.net/zpufky7u/1/
I have many forms on the site, which was working fine, but just suddenly angular is binding all the forms with class="ng-pristine ng-valid"
Is this a setting or what can cause angular to auto-bind forms?
I'm using angular version: angular#1.4.7
Following is my form, as you can see there is no model inside form
<form name="app_bundle_notification_type" method="post">
<div class="row">
<div class="col-sm-8">
<div class="form-group">
<div class="checkbox">
<label class="required">
<input type="checkbox" id="app_bundle_notification_type_isNewsletter" name="app_bundle_notification_type[isNewsletter]" required="required" value="1" checked="checked">
Yes, I would like to receive email newsletter for new deals, coupons and news.
</label>
</div>
</div>
</div>
</div>
<div class="row m-y-1">
<div class="col-sm-12">
<button type="submit" class="btn btn-success">Save</button>
</div>
</div>
<input type="hidden" id="app_bundle_notification_type__token" name="app_bundle_notification_type[_token]" class="form-control" value="b-_qAF6LHFy_GtPlsFG3iguhVXfGsj38TXm22Ke8j0k">
</form>
Angular app.js
define(['angular'], function() {
var app = angular.module("myApp", []);
app.init = function () {
angular.bootstrap(document, [app.name]);
};
return app;
});
So far I found the issue, if you do angular.bootstrap(document, [app.name]); then it is binding the form. it was not causing this issue before.

Answer 1

Presuming you are using a form tag around your form, Angular automatically adds those classes to each ng-model inside your form.
This allows you much more control over the elements inside your form to perform any validation or logic you want your form to capture or enforce before submitting.
Much of it is listed in the docs here

Answer 2

https://docs.angularjs.org/api/ng/directive/form
For this reason, Angular prevents the default action (form submission
to the server) unless the <form> element has an action attribute
specified.
New version accepts empty action="", check release version at https://github.com/angular/angular.js/pull/3776