Apple's iPhone Duo launches without Safari support for key foldable web standard

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Apple unveiled the iPhone Duo, its first foldable smartphone, on September 10th, priced at $1,999. The device features two displays with nearly matching 1:1.42 aspect ratios — a folded outer screen at roughly 466x678pt and an unfolded landscape inner screen at about 890x626pt. These unusual proportions fall outside the ranges that most existing mobile and tablet CSS breakpoints are designed to handle. CSS Viewport Segments, the web standard built to help developers detect and adapt to foldable screen states, is supported only in Chrome and Edge — not Safari. This means the first foldable iPhone ships without the browser API specifically designed to manage fold-aware web layouts.

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