About
A browsing context group is a group of:
- tabs,
- windows
- or iframes
which share the same context.
Example
- If a website (https://a.example) opens a popup window (https://b.example),
- the opener window and the popup window share the same browsing context
- and they have access to each other via DOM APIs such as window.opener.
Check
You can check if the window opener and its openee are in separate browsing context groups from DevTools.
