MC-4189: IE11 - PageBuilder Does Not Load

- Resolve flaky tests

Author: davemacaulay

app/code/Magento/PageBuilder/Block/Adminhtml/Html/Head/BabelPolyfill.php

@@ -11,9 +11,7 @@
 use Magento\Framework\View\Element\Template;
 
 /**
- * Class BabelPolyfill
- *
- * @package Magento\PageBuilder\Block
+ * @api
  */
 class BabelPolyfill extends Template
 {

app/code/Magento/PageBuilder/view/adminhtml/templates/head/babel-polyfill.phtml

@@ -6,10 +6,10 @@
 
 /* @var $block \Magento\PageBuilder\Block\Adminhtml\Html\Head\BabelPolyfill */
 
-if ($block->shouldLoadPolyfill()): ?>
-<script type="text/javascript">
+if ($block->shouldLoadPolyfill()) : ?>
+<script>
     if (/MSIE \d|Trident.*rv:/.test(navigator.userAgent)) {
-        document.write('<script src="<?= $block->getJsUrl() ?>"><\/script>');
+        document.write('<script src="<?= $block->escapeUrl($block->getJsUrl()) ?>"><\/script>');
     }
 </script>
 <?php endif; ?>