Angular form validation in IE - validation

Question

I'm trying to get Angular form validation working in ie8. Here is my code:
<form id="contact-form" name="cform" target="_blank" >
<div class="left">
<div>
<div class="group">
<label for="firstname">First Name <span class="asterisk">*</span></label><br />
<input type="text" name="firstname" id="firstname" data-ng-model="firstname" required />
<span class="error" data-ng-show="cform.input.$error.required">Required!</span>
</div>
<div class="group">
<label for="lastname">Last Name <span class="asterisk">*</span></label><br />
<input type="text" name="lastname" id="lastname" data-ng-model="lastname" required />
<span class="error" data-ng-show="cform.input.$error.required">Required!</span>
</div>
</div>
<div>
<div class="group">
<label for="email">Email Address <span class="asterisk">*</span></label><br />
<input type="email" id="email" name="email" data-ng-model="email" required />
<span class="error" data-ng-show="cform.email.$error.email">Required!</span>
</div>
</div>
<div>
<div class="group">
<label for="phone">Primary Phone Number <span class="asterisk">*</span></label><br />
<input type="text" name="phone" id="phone" data-ng-model="phone" required />
<span class="error" data-ng-show="cform.input.$error.required">Required!</span>
</div>
<div class="group">
<label for="-secondary-phone">Secondary Phone Number</label><br />
<input type="text" name="secondary-phone" id="secondary-phone" />
</div>
</div>
</div>
<div class="right">
<div class="group">
<label for="message">Your Message</label><br />
<textarea id="message"></textarea>
</div><br />
<input type="submit" value="SEND MESSAGE" class="button">
</div>
</form>
This works in Firefox and Chrome, but in IE8 no validation errors are triggered. Anyone know what the issue might be?
Thanks.
UPDATE: This seems to be a problem in all versions of IE. {{cform.input.$error}} and {{cform.input}} don't show output in any browser.

Answer 1

<div class="group">
<label for="firstname">First Name <span class="asterisk">*</span></label><br />
<input type="text" name="firstname" id="firstname" data-ng-model="firstname" ng-required="true" />
<span class="error" data-ng-show="cform.firstname.$error.required && cform.firstname.$dirty">Required!</span>
</div>

Answer 2

Ie 8 does not support html 5 ,Angular is using html 5 , Do the work around to get angular working on IE and then use the pattern because you cant use the html 5 element