title: shopify scriptTag - how to add css file dynamically?
body: <p>I would like to add an option to merchants to include our snippet on their product and cart pages automatically.</p>
  
  <p>For this we plan to use scriptTag that inserts the html to show the snippet.</p>
  
  <p>My questions:</p>
  
  <ol>
  <li>is it possible to load a custom css file when our code runs?</li>
  <li>How can I tell if the code runs on the product or cart pages?</li>
  </ol>
  
  <p>Thanks for the help</p>