That because the measurements used in web browser, “px”, doesn’t mean “screen pixels”.
According to the W3 website :
“The px unit is defined to be small but visible, and such that a horizontal 1px wide line can be displayed with sharp edges (no anti-aliasing). What is sharp, small and visible depends on the device and the way it is used: do you hold it close to your eyes, like a mobile phone, at arms length, like a computer monitor, or somewhere in between, like an e-book reader? The px is thus not defined as a constant length, but as something that depends on the type of device and its typical use.”
So a very high definition smartphone can be seen as being less than 800(px)x600(px), depending on its screen size and aspect ratio, while still being 4k or more.
That because the measurements used in web browser, “px”, doesn’t mean “screen pixels”.
According to the W3 website :
“The
pxunit is defined to be small but visible, and such that a horizontal 1px wide line can be displayed with sharp edges (no anti-aliasing). What is sharp, small and visible depends on the device and the way it is used: do you hold it close to your eyes, like a mobile phone, at arms length, like a computer monitor, or somewhere in between, like an e-book reader? Thepxis thus not defined as a constant length, but as something that depends on the type of device and its typical use.”So a very high definition smartphone can be seen as being less than 800(px)x600(px), depending on its screen size and aspect ratio, while still being 4k or more.