magento/magento2-page-builder#558: Developer can style content types output differently per viewport - Fixed quote marks

Author: hannahnida

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymce4Adapter.js

@@ -205,7 +205,7 @@ define([
                 plugins: this.config.tinymce4.plugins,
                 toolbar: this.config.tinymce4.toolbar,
                 adapter: this,
-                body_id: "html-body",
+                'body_id': 'html-body',
 
                 /**
                  * @param {Object} editor