How to Open Two Safari Windows Side by Side on iPhone Duo
Apple is introducing the iPhone's first Split View mode that can place two windows of the same app, including Safari, side by side, a capability new to iOS (Apple Newsroom, two months ago). If you're searching for how to open two Safari windows side by side on iPhone Duo, the current answer is limited: Apple confirms the feature exists, but its published materials don't explain the activation gesture.
Apple's September announcement states that Split View lets users "open two windows of the same app, like Safari," naming the browser specifically (Apple Newsroom, two months ago). A separate Apple Newsroom post about developer app updates adds that Split View lets people "open two apps side by side on iPhone for the first time," though that line describes two different apps running together, not the same-app, two-Safari-window detail from September (Apple Newsroom, last week). Both are announcements of a shipped capability, not independent proof the feature behaves the same way in every configuration a user might try. Neither post explains what someone taps, swipes, or holds to make the second Safari window appear.
iPhone Duo went on sale October 23 running iOS 27.1 (Apple Newsroom, last week), and Apple's WebKit team published its Safari 27.1 engineering notes that same day (PPC Land, citing WebKit, this week). The phone is now available in 28 more countries and regions as of today, October 30 (Apple Newsroom, last week). Anyone unfolding the device and hunting for the two-window layout is working from the same documentation covered here, and neither source names the control that triggers it.
What iPhone Duo Safari split screen documentation actually says
WebKit's Safari 27.1 post includes a table of documented viewport configurations, and one row is labeled specifically for this feature: "Inner display, two windows side by side," listed at 385 CSS pixels wide, with small and large viewport heights of 571 and 609 pixels (PPC Land, citing WebKit, this week). That's a separate entry from single-window inner-display landscape use, which measures 951 pixels wide, showing that WebKit accounted for a two-window configuration as its own distinct layout rather than an afterthought.
WebKit's text adds that "in landscape on the inner display, users can place two windows side by side," which confirms the pose WebKit documented: the phone unfolded to its 7.6-inch inner screen, held in landscape (PPC Land, citing WebKit, this week). It doesn't rule out other poses, since WebKit never claims that's the only configuration that works, and it stops short of describing what launches the second window.
What iPhone Duo owners can check on their device now
Checking software readiness is the easy part. Open Settings > General > About to confirm the device is running iOS 27.1, the build WebKit tied to iPhone Duo's launch (PPC Land, citing WebKit, this week). Owners can first check whether they're on that version before testing anything else.
From there, the documented pose is the inner display, unfolded, held in landscape. Opening Safari in that position matches the exact configuration WebKit's viewport table associates with two-window layouts. Matching the pose confirms the device and software line up with what WebKit described; it doesn't guarantee Split View will appear, because the Apple announcements and WebKit post cited here don't identify a gesture, button, or menu.
Any specific tap sequence, long-press, or hidden-menu claim circulating online should be treated with caution, at least based on the materials covered here. Neither Apple's newsroom posts nor WebKit's writeup names a control, so instructions describing one aren't backed by either primary source in this article.
The PDF two-page trick that looks like Split View but isn't
Safari 27.1 has a feature that's easy to confuse with Split View: automatic two-page PDF viewing. When iPhone Duo is held partially folded, like a book, Safari shows web-hosted PDFs as two pages side by side, then switches back to a single page once the device opens flat or closes (MacRumors, this week; PPC Land, citing WebKit, this week).
That behavior is specific to PDFs opened in the browser. Ordinary webpages keep whatever layout their developers built, and Safari doesn't automatically carve a regular site into two columns (PPC Land, citing WebKit, this week). Anyone who sees a PDF split into two pages has found a different feature, one triggered by how the phone is folded, not by a tap or swipe.
Sites that weren't built with narrow screens in mind may still look cramped or break inside a Split View pane, since each pane renders narrower than most phones use for a single tab. That's a risk inferred from the narrow viewport, not a documented widespread problem. WebKit's guidance for developers is that responsive sites should work across every size in its viewport table, though that's a recommendation, not a guarantee every existing site already meets it (PPC Land, citing WebKit, this week).
Experimental fold APIs: developer tools, not a Split View switch
Safari 27.1 also ships two experimental web APIs tied to the device's fold: the Device Posture API and the Viewport Segments API. Both are off by default, but developers can turn them on under Settings > Apps > Safari > Advanced > Feature Flags (PPC Land, citing WebKit, this week).
Turning on those flags doesn't open a second Safari window. They let a website detect whether the device is folded or flat and adjust its own layout around the fold; they don't control how Safari arranges its windows. The Device Posture API reports one of two states, folded or continuous, while the Viewport Segments API, which WebKit calls more complex, describes the display's separate sections on either side of the fold through two new media queries (PPC Land, citing WebKit, this week). Flipping these flags changes how individual websites render; it's not a multitasking shortcut.
Safari's browser controls may also waste space in each pane
Safari 27.1 can't yet extend webpages into the area behind its on-screen browser controls. Instead it samples the page's background color and fills that strip (PPC Land, citing WebKit, this week; MacRumors, this week). That's a general Safari 27.1 limitation, not something specific to Split View, but it matters more inside a 385-pixel-wide pane, where every bit of width counts.
Jen Simmons, who wrote the Safari 27.1 release notes, said the team is investigating a different approach after noticing that many sites fail to properly inset content around all four edges of the screen (MacRumors, this week). Apple has not given a timeline or committed to a final approach.
What to do now
Apple has publicly described the Split View capability, and WebKit's documentation includes a matching viewport configuration for two windows (Apple Newsroom, two months ago; PPC Land, citing WebKit, this week). What's missing from the Apple and WebKit materials cited here is the activation step: no gesture, button, or menu is named.
Owners can confirm they're running iOS 27.1, try Safari from the inner display in landscape, and treat any other gesture instructions found elsewhere with some skepticism until Apple publishes a support article or independent hands-on testing shows exactly how the second window gets triggered.
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