Viewport Size for iPhone X?

The iPhone X resolution is 2436 x 1125 px. Does anyone know, given those specs, what the viewport size in pixels is?

Its resolution is 1125x2436 at 3x resolution. So a full size image would at 3375px wide x 7308px height would fill the screen at its highest resolution. Nuts.

As for viewport width, it’s the same as the iPhone 6, 6s, 7, and 8:

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Thanks for the incredibly quick reply, Daniel!

According to the page you linked, it’s not that high. It’s a base size of 375x812, which is close to the original iPhone size of 320x480. So, 3x of 375x812 is 1125x2436.

For purposes of responsive design the iphone X viewport is 375 x 635

you can easily check here . not only ipx but for all phones