The up screen resolution is 400×240. However, the viewable area in the browser is only <b>400×215</b>.
The up screen resolution is 400×240. However, the viewable area in the browser is only <b>400×215</b>.
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The touch screen resolution is 320×240. However, the viewable area in the browser is only <b>320×212</b>.
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The touch screen resolution is 320×240. However, the viewable area in the browser is <b>320×212</b> <em>or</em> <b>320×240</b>, depending on if the bottom browser bar is visible. The New3DS browser's bottom bar can hidden by scrolling and/or attempting to zoom in/out with the C-stick, unless scrolling and zooming have both been disabled.
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You can have a page span both screens. However, the browser will behave as if the bottom screen is the only active screen and the top screen is scrolled off. This is important when computing CSS coordinates. Items positioned from "bottom" will be positioned based on 215px and not the full 427px of both screens.
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You can have a page span both screens. However, the browser will behave as if the bottom screen is the only active screen and the top screen is scrolled off. This is important when computing CSS coordinates. Items positioned from the "bottom" will be positioned based on the height of the bottom screen, not the cumulative heights of both screens.