Tiny, lightweight function to detect Flexbox support.

flexbox_supported.js

// Expanded
var flexboxSupported = (function(){
    var prop = "flex-basis:1px";
    var el = document.createElement("div");
    var prefixes = ["", "-webkit-", "-moz-", "-o-", "-ms-"];
    for(var i=0; i<prefixes.length; i++){
        el.style.cssText += prefixes[i]+prop;
        if(!!el.style.length) return true;
    }
    return false;
})();

// Compressed
var flexboxSupported = (function(){for(var b=document.createElement("div"),d=["","-webkit-","-moz-","-o-","-ms-"],c=0;5>c;c++)if(b.style.cssText+=d[c]+"flex-basis:1px",b.style.length)return!0;return!1})();