Enumerates all properties of an object, including those found along the prototype chain.

Proto-Crawler.js

var output = (function ( object ) {
    
    "use strict";
    
    function getProperties ( object ) {
        return object ? Object.getOwnPropertyNames( object )
            .concat( getProperties( Object.getPrototypeOf( object ) ) ) : [] ;
    }
    
    function getUnique ( array ) {
        return array.filter(function ( value, index ) {
            return array.lastIndexOf( value ) === index;
        });
    }
    
    return getUnique( getProperties( object ).sort() );
    
}( window ));

/* Choose how you'd like it output */
document.body.style.whiteSpace = "pre";
document.body.textContent = JSON.stringify( output, null, "\t" );

Pretty cool code. I was thinking of writing something just like to estimate how much of a browser's 'HTML5' support is proprietary/prefixed. Kind of like an html5test.com where your score goes down for every -ms/-webkit/-moz it finds.

Good idea. Vendors explicitly state that prefixed code is experimental and not intended for production. Yet developers equal anything with a prefix as "shipped," and ready for broad consumption. This is reflected in tests, giving skewed impressions of where a browser truly is in supporting any given technology. Would love to know if/when you approach that effort.

I reached out to @ifandelse regarding this approach and he had some really great insight. Greatly modified the approach based on his direction. Smart fellow.