If you specifically need a Windows XP experience without installing a Virtual Machine, several other projects have achieved this by "skinning" modern web technologies or using more modern emulators like :
While performance is not native—expect "slow but functional" speeds—it is more than sufficient for running classic XP applications, exploring the UI, or testing legacy drivers without security risks.
An open-source project hosted on GitHub that runs a stripped-down version of XP in the browser. It allows for basic registry editing and runs entirely in the client-side RAM.