iOS in app browser not rendering correctly

[ballooning15]

If I place a link to my web site on an ebay listing

https://www.ebay.co.uk/itm/164293305386

You'll see a hidden link at the bottom (underscore) - it loads the site

https://www.hengardirect.co.uk/

But all icons are missing from the page when viewed via the ebay app.

All other mobile browsers including the in app browser on facebook for example, all work ok displaying the icons.

I've had to remove the a tags temporarily to force people to copy and paste the link into their own normal browser, but this isn't ideal... 

What browser engine is the ebay ios app using?? 

Thanks for any help!

[ballooning15]

It might appear that in fact ANY svg file doesn't display )-:

[eburtonlab]

With a few very specific exceptions, eBay does not allow external links in listings:

https://www.ebay.com/help/policies/listing-policies/links-policy?id=4248