Remove role="form" on a form element.

Role Form should be use on a region of the document that  represents a collection of form-associated elements.
<div role=”form”></div> GOOD
<form role=”form”></form> BAD

templates/default/product.html

@@ -137,7 +137,7 @@
                 </div>
 
                 {form name="thelia.cart.add" }
-                <form id="form-product-details" action="{url path="/cart/add" }" method="post" role="form" class="form-product">
+                <form id="form-product-details" action="{url path="/cart/add" }" method="post" class="form-product">
                     {form_hidden_fields form=$form}
                     <input type="hidden" name="view" value="product">
                     <input type="hidden" name="product_id" value="{$ID}">