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iOS 26.0 introduces new Safari tab modes with "Liquid Glass" design that breaks existing modal implementations with transparent backgrounds. The update changes viewport height (VH) unit behavior and window.outerHeight calculations. Solutions include setting backgrounds on html/body elements, using transparent black overlays for dimming, and wrapping content in blur containers. Different tab modes (Compact, Bottom, Top) now have varying window.innerHeight values, with Top mode providing the largest usable screen space at 768px.