These are the known issues in terms of support for various browser capabilities. In future versions some of these might be resolved.
Because Polypane works with panes, all popups are disabled.
To show pages in multiple panes within the same window, Polypane does not adhere to Content Security Policies and is therefore not recommended to be used for regular web browsing.
User agent sniffing
Though Polypane mimics the viewports of devices, it does not mimic the user agent of these devices. Scripts depending on user agent sniffing will thus not work with Polypane. Browser sniffing or user agent sniffing is discouraged in general, and it's better to rely on feature detection instead.
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