If you want to set Webpage as Desktop Background on your Windows computer, use Webpage Mirror Wallpaper, a dedicated Microsoft Store app.

Somehow, another user of this PC has changed the desktop wallpaper (background). It’s slightly frustrating to me that I don’t know how they’re doing it, considering my background.

Learn how to find the location of the current desktop background image file (a custom picture, slideshow image, etc.) stored in Windows PC.

If you're looking to make your desktop background more dynamic, you should try embedding a video with the open source app Lively Wallpaper.