What the iPhone Duo means for web development
Blog post from Mux
Following the release of Video.js 10.0.0, the author explored web support for Apple’s foldable iPhone Duo through Xcode’s beta simulator and feature flags, focusing on the Device Posture API and Viewport Segments API. These APIs let web applications detect whether a device is folded and identify the size and position of separate display regions, enabling layouts that avoid hinges or distribute content across screens. Using Video.js’s new composable architecture, the author created an experimental fullscreen video interface that places video on the upper display segment and playback controls on the lower one, then added a blurred, mirrored canvas reflection inspired by Netflix’s foldable-phone interface. However, the experiment required multiple experimental flags, encountered unexpected segment-positioning behavior, and faced fullscreen restrictions on both the simulated iPhone Duo and a Pixel Fold emulator, where Chromium clips fullscreen content to the top screen.
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