page visibility API : tribulations with prefixes

gistfile1.js

// this is the least sucky way i could think of to 
// detect and deal with a cross-browser impl of the page visibility api
// forks welcome.


function getHiddenProp() {
    if ('hidden' in document) return 'hidden';

    var prefixes = ['webkit','moz','ms','o'],
        len = prefixes.length,
        i = 0;

    for ( ; i < len; i++) {
        if ((prefixes[i] + 'Hidden') in document) 
            return prefixes[i] + 'Hidden';
    }        
}

function isHidden() {
    return document[getHiddenProp()] || false;
}

// events
var evtname = getHiddenProp().replace(/hidden/i, 'visibilitychange');
document.addEventListener(evtname, fn)




// just logging it out. log it out, man.
console.log('getHiddenProp()', getHiddenProp());
console.log('isHidden()', isHidden());


function fn(){}