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/includes/single-product.html

@@ -60,7 +60,7 @@
             </div>
             {if $hasBtn == true}
             {form name="thelia.cart.add" }
-            <form id="form-product-details" action="{url path="/cart/add" }" method="post" role="form" class="form-product">
+            <form id="form-product-details" action="{url path="/cart/add" }" method="post" class="form-product">
                 {form_hidden_fields form=$form}
                 <input type="hidden" name="view" value="product">
                 <input type="hidden" name="product_id" value="{$ID}">