cgrade: C grade browser support

The idea is to make sure crappy browsers get ONLY html; No CSS, no Javascript.

There are 3 parts:

The test -- tells us if a browser is up to snuff or not. this code will have to run in any browser that attempts to run it. it needs to run in head, without a body

standards mode (document.compatMode = 'CSS1Copmpat') // the most basic test: elimiates ie5 and safari2
Supports Css 2.1 selectors + inline-block // a much stronger test -- eliminates IE6 and FF2
w3c dom event registration // removes ie < 9, but allows firefox 1
something stronger? html5 support should be left to modernizr

The bootstrap loader -- pulls in a javascript file has to run in any browser that passes the test expect ie workarounds here

should load javascript asynchronously, non-blocking.
either a: one built, concatenated and minified file
or b: a file that will then to the loading for the rest of the site

The FOUC evader before the body loads use css to hide any parts of the page that will be improperly styled after we're fully done remove those styles. -- client will have to call this.

even pages that are progressively enhanced will want to use the FOUC evader to hide their "Use a real browser" message

body class: no-js --> loading --> done/ready/user-supplied-class/nothing
elemclass: loadhidden
html.loading .loadhidden { display:none }

There are 3 outcomes: in a browser with no JS/js disabled: They see the plain page in a browser that fails the test: They see a plain page and no js errors -- code will have to work in ns2/ie3/j. random browser. in a browser that passed the test: page is unrendered during head processing troublesome elements are hidden to prevent FOUC (domcontentloaded/window.onload fires here?) js and css are downloaded and applied .loading class is removed / page is ready (user supplied)

Ultimately, I hope that all 3 parts will be small enough to inline them into the head tag of yuor page