I have searched high and low for a solution to this problem, and while I found one question, I have found zero responses. I'll lay out the entire situation because maybe there's a solution I'm not seeing...
However, some files have links to "supporting assets", which are essentially separate HTML pages themselves, except without the actual page. Here's an example:
Supporting Asset *Note, there may be some syntax issues in my recreation, but I promise the syntax is all correct in the actual code.
I've tried appending...
...to the raw HTML before loading it into the webview. Nothing.