Internet browsers tend to include Developer Tools. I can even cable-connect my iPhone to a Mac and use the Mac’s Safari DevTools in order to examine what Brave Browser (iOS) is doing on the iPhone.
May interest:
Using Developer Tools:
‘Can no longer log into X.com - #7 by 289wk’
Tool Tip example: Using Brave Site-Specific Shields > Fingerprinting granular controls - solved a website [compatibility?] font issue:
‘Some websites don't render with the correct fonts - #3 by LinuxGuy-cyber’