[yscik]

Meanwhile the site has a fixed header taking away vertical space, like many others. Maybe interface design should accomodate the fact that every single desktop user uses a widescreen display and start putting navigation on the side. Vertical tabs and taskbars can also be done in most browsers and OSes. There would probably be a lot of friction if vendors made that the default, but it's still easier than replacing every monitor in existence.

[madmulita]

At least the header has something in it, the white margins are completely useless but eat a lot of real state.

[UncleEntity]

Yes, the ability to "tweet" and "share". Neither of which I ever do so it's just a bunch of wasted space.

My favorite is the headers that mess up scrolling with the space key -- scroll down then immediately scroll up because the header is covering part of the content.

And don't even get me started on sites (looking at you Medium) that have both headers and footers...

[exergy]

ublock's "content rule" feature gets a lot of use out of me for this exact reason.