Poll Stylesheets until they exist in document.styleSheets

gistfile1.js

var stylesheets = Array.prototype.slice.call(document.querySelectorAll('link[href*=".css"]'))

var sheets = document.styleSheets;

function pollSheets() {
    var i, j, load_count = 0;
    for (i = 0; i < stylesheets.length; i++) {
        for (j = 0; j < sheets.length; j++) {
            // check if stylesheet exists in document.styleSheets
            if (sheets[j].href && sheets[j].href.indexOf( stylesheets[i].href ) > -1) {
                console.log('ready: ' + stylesheets[i].href);
                load_count++;
            }
        }
    }

    if (load_count >= stylesheets.length) {
        // done
        console.log('all ready');
        return;
    }
    // poll again
    setTimeout(pollSheets);
}
pollSheets();