What do you suppose we do about it? Like it or not, people use web browsers to access the Internet, and as long as web browsers render HTML and CSS, we have to use the tools we have.

CSS was originally designed only for inline and block layout in a traditional single column of text with left or right floated figures. It has never had any features specifically designed for full page layout, but people have done lots of hacks to use inline, block, margins, padding, and floats to achieve full-page layouts they were never designed for.

There have been improvements in CSS2 and CSS3, like adding table layout so people could at least use the table layout features on div elements rather than abusing tables for layout, and CSS flexbox that work well for standard UI widget layouts.

But the big fixes to layout have been harder to specify and agree upon. They've been in the works for many years, but it's taken a while to figure out how they really should work, and which parts should be fundamental. It looks like it's getting a lot closer; the CSS Grid Module http://dev.w3.org/csswg/css-grid/ is being treated as the fundamental part of the stack on which others will build, it is being worked on by several browser vendors and is in highly active development, and several browsers have implementations in development. It seems to draw elements from IE's experimental CSS grid, as well as the templates of the earlier template layout proposal.

So, yeah, for many years CSS has had a big deficiency in specifying page layout. It's going to get better very soon, however, once the CSS Grid Module is finished and implemented. I'd imagine we'll start seeing implementations within a year; here's Webkit's tracking bug for it: https://bugs.webkit.org/showdependencytree.cgi?id=60731&hide... here's Chromium's: https://code.google.com/p/chromium/issues/detail?id=79180 . Mozilla doesn't seem to be working on it yet, though they have had some preliminary discussion: https://bugzilla.mozilla.org/show_bug.cgi?id=616605 . IE had implemented an experimental Grid Layout proposal that the current work is based on, so while the syntax won't be exactly the same, they have most of the underlying functionality working: http://msdn.microsoft.com/en-us/library/ie/hh673533(v=vs.85)...

yet, despite this the web seems to be doing just fine, apps are powerful, often better than native and nobody (else) seems to be complaining that much. Sure, some things take actual skill to implement. We live in an imperfect world, and while it's always easy to blame the tools, it's far better to just get on with improving things and making the best of what we have. It's a far better world today that the setup.exe days.

Name another software runtime that even partially works as well cross-platform. Or another runtime that has the notion of multiple competing implementors.

There have been attempts to fix this by creating languages which compile to each of those: HAML for HTML, CoffeeScript/Dart for JS, SASS/LESS for CSS. The language benefits tend to be fairly obvious, but there hasn't been much of anything in the way of native browser adoption that I've seen yet, apart from Google's plans for Chrome & Dart.