This pattern is used for referencing custom JavaScript files.
How this works
Include custom JavaScript
Yes - Indicates that custom JavaScript will be used.
Selecting this option causes the JavaScript reference group to be displayed.
No - Indicates that custom JavaScript will not be used.
JS reference
This group contains all the fields necessary for defining a reference to a single JavaScript file.
You can define multiple JavaScript references by using the Add new group 
button to the right of the group label.
Type
Asset - Indicates the JavaScript file is located in Cascade as a part of your site.
Selecting this option causes the File field to display.
URL - Indicates the JavaScript file exists somewhere on the web.
Selecting this option causes the URL, Crossorigin handling, and Integrity fields to display.
File
Only displayed when Type is set to ‘Asset’.
Use the asset chooser to select the desired JavaScript file in your Cascade site.
URL
Only displayed when Type is set to ‘URL’.
Enter the full URL of the CSS file in the URL text field.
Placement
Indicates where in the html document the JavaScript file reference will be placed.
<head> - The JavaScript reference will be included in the html document head.
<body> - The JavaScript reference will be included at the end of the html document body.
Execution option
Default - Has not affect.
defer - Sets the defer attribute on the script reference.
async - Sets the async attribute on the script reference.
Crossorigin handling and Integrity
Only displayed when Type is set to ‘URL’.
Some websites also provide integrity and crossorigin attribute values with their hosted files.
<script .... crossorgin=”....” integrity=”....”></script>
Use the Crossorigin handling and Integrity fields to provide the respective values.