I’m trying to use Katex to render mathematical formulas on my website. It works perfectly fine on desktop browsers, but when I open the same page on mobile using Quick Edit, I get an error message: "Katex doesn't work in quirks mode. Make sure your website has a suitable doctype." I’ve already added the declaration, but the error still persists. The page renders correctly in Edge in Mobile.

Here’s a simple test page:

  
  
  
  
  
  



  
Katex Test
  
\(E = mc^2\)
  

enter image description here

What could be causing this error in QuickEdit? Or any other Android HTML IDEs that support Katex rendering? Any advice or suggestions would be much appreciated.