docs(compile/nodomevents): description for compile/nodomevents error

Closes angular#3459

Author: mhevery

docs/content/error/compile/nodomevents.ngdoc

@@ -2,3 +2,19 @@
 @name $compile:nodomevents
 @fullName Interpolated Event Attributes
 @description
+
+This error occurs when one tries to create a binding for event handler attributes like `onclick`, `onload`, `onsubmit`, etc.
+
+There is no practical value in binding to these attributes and doing so only exposes your application to security vulnerabilities like XSS.
+For these reasons binding to event handler attributes (all attributes that start with `on` and `formaction` attribute) is not supported.
+
+
+An example code that would allow XSS vulnerability by evaluating user input in the window context could look like this:
+```
+<input ng-mode="username">
+<div onclick="{{username}}">click me</div>
+```
+
+Since the `onclick` evaluates the value as JavaScript code in the window context, setting the `username` model to a value like `javascript:alert('PWND')` would result in script injection when the `div` is clicked.
+
+