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by rafram 770 days ago
Firefox, for one, technically supports "popping out" part of a page's content into a separate OS-level window. It exposes that functionality through the XUL <panel> and <menupopup> elements, which are only available to privileged [X]HTML being rendered in the browser's main process. I doubt that any browser developer would want to give ordinary web pages the ability to create borderless OS windows.