A website should work at any sane screen resolution, landscape or portrait. At minimum it should crop itself down to an aspect ratio it can handle. I would as

A website should work at any sane screen resolution, landscape or portrait. At minimum it should crop itself down to an aspect ratio it can handle. I would assume though that the news websites you've encountered were built with only office PCs in mind though, and just happen to work on the similar screen of a landscape tablet.