Referencing the HTML fragment using a publishing template

If you haven't already created a Publishing Template, see Working with publishing templates.
Insert the HTML content in a well-formed XML file (for example, custom-html.html).
Using the Project view, copy your custom HTML fragment in a folder inside publishing the template root folder (for example, in the custom_footer_template/html-fragments folder).
Open the template descriptor file associated with your publishing template and add a reference to the custom HTML fragment in the html-fragments section.
```
<publishing-template>
    ...    
    <webhelp>
     ...
     <html-fragments>
       <fragment 
       file="html-fragments/custom-html.html" 
       placeholder="webhelp.fragment.head"/>
```
Note: If you want to insert the content in another location within the output document, you can reference the XML file from any other HTML fragment extension points.
Open the DITA Map WebHelp Responsive transformation scenario.
Click the Choose Custom Publishing Template link and select your template.
Click OK to save the changes to the transformation scenario.
Run the transformation scenario.

Your additional content will be included at the end of the head element of your output document.