How can I recreate this layout for my site? (frame-over-frame)
Does it use a standard JavaScript library?
I’m looking for JavaScript/CSS (or tutorial)…

Thanks
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These are not frames.
The most relevant techniques for Chrome’s settings / Webstore page are:
box-shadow– To show a shadow.z-index– To show the layers in the correct orderhistory.replaceState– To change the URL.The full CSS and HTML code can be viewed by using
Inspect elementatchrome://settings.