iPad Pro M4 11″ / 13″: Screen Size & CSS Viewport

The iPad Pro M4 marked a turning point for tablet displays: Tandem OLED technology arrived in iPad for the first time, stacking two OLED panels to achieve 1600 nits HDR while maintaining perfect blacks. This debut raised the visual standard for web content on iPad — users who upgraded from LCD iPads immediately noticed the improved depth and contrast.

At 5.1 mm, the M4 iPad Pro was Apple's thinnest product at launch. The ultra-thin profile influences how users hold and orient the device. A thinner tablet is more frequently used without a case and more often held in portrait orientation in one hand — which means the 834px portrait viewport is the primary reading and browsing mode for many M4 Pro users.

For developers, 834×1210 portrait is the CSS viewport to test for the vast majority of iPad Pro interactions. The common assumption that iPads are used primarily in landscape (where the viewport widens to 1210px) is worth revisiting — thinner, lighter iPads promote portrait use.

The M4 chip performance also means web apps that previously felt sluggish on iPad — large React applications, heavy data visualizations, WebGL content — now run smoothly, making iPad a more serious web application platform.