Window.open Features [portable] -

, 500);

This approach makes window.open() actually rather than annoying — respectful of user expectations, robust against blockers, and easy to reuse. window.open features

// Usage openSmartPopup('https://example.com', 'HelpfulWindow', 900, 700); | Feature | Benefit | |---------|---------| | Centered positioning | User-friendly, doesn't open off-screen | | Ref tracking | Reuses existing window instead of duplicate popups | | Focus handling | Brings existing popup to front if already open | | Fallback alert | Informs user if popup blocker interferes | | Sensible defaults | Includes toolbars, scrollbars, location bar for usability | | Auto cleanup | Removes reference when popup closes | Minimal version (if you just need the feature string): function getCenteredFeatures(w = 800, h = 600) const left = (screen.width - w) / 2; const top = (screen.height - h) / 2; return `width=$w,height=$h,left=$left,top=$top,resizable=yes,scrollbars=yes,toolbar=yes,location=yes`; , 500); This approach makes window