Real thing is possible on https://copy.sh/v86/ I think but need an XP disk image[1], not readily available at the moment (probably for copyright reasons?).
Windows 2000 is also available in the above (with more pre-installed apps).
Better yet ditch the browser and get a proper emulator, preferably one that emulates all the period-accurate hardware such as https://86box.net.
Is 86box period-accurate for Windows XP? It seems to go up to Socket 370 (Pentium III) which is very early for XP. Additionally, from my experience using PCem (which 86box is based on), you need pretty beefy hardware to emulate a Pentium II or K6, let alone to go beyond them. And those are period-accurate for Windows 98, not XP.