There is a limit on minimal width/height, so it’s impossible to create an invisible window.

width/height (numeric) – width and height of a new window.

There is a limitation: a new window cannot be positioned offscreen.

left/top (numeric) – coordinates of the window top-left corner on the screen.

There must be no spaces in params, for instance: width=200,height=100. It contains settings, delimited by a comma.

params The configuration string for the new window. If there’s already a window with such name – the given URL opens in it, otherwise a new window is opened. Each window has a window.name, and here we can specify which window to use for the popup. The syntax to open a popup is: window.open(url, name, params): url An URL to load into the new window.

This way users are somewhat protected from unwanted popups, but the functionality is not disabled totally. Most browsers block popups if they are called outside of user-triggered event handlers like onclick. So now most browsers try to block popups and protect the user. A bad page could open tons of popup windows with ads. In the past, evil sites abused popups a lot.

A popup can navigate (change URL) and send messages to the opener window.So opening a popup from a third-party, non-trusted site is safe. A popup is a separate window which has its own independent JavaScript environment.for OAuth authorization (login with Google/Facebook/…), because: Still, there are tasks where popups are still used, e.g. So, popups is not something we use everyday.Īlso, popups are tricky on mobile devices, that don’t show multiple windows simultaneously. As of now, there are other ways to do that: we can load content dynamically with fetch and show it in a dynamically generated. The initial idea was to show another content without closing the main window. Most modern browsers are configured to open url in new tabs instead of separate windows. …And it will open a new window with given URL.

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