MAGETWO-97671: Invalid action behavior

Author: zakdma

app/code/Magento/Email/view/adminhtml/templates/preview/iframeswitcher.phtml

@@ -13,7 +13,7 @@
             frameborder="0"
             title="<?php echo $block->escapeHtml(__('Preview')) ?>"
             width="100%"
-            sandbox="allow-scripts allow-forms allow-pointer-lock"
+            sandbox="allow-forms allow-pointer-lock"
             src="<?php echo $block->escapeUrl($block->getUrl('*/*/popup', ['_current' => true])) ?>"
     />
 </div>