http://ahmethakanbesel.com.tr/olusturmayi-onleyen-javascript-ve-css-kodlarini-ekranin-ust-kismindaki-icerikten-kaldirin-cozumu

js-render-css.js

<script>
    var loadDeferredStyles = function() {
        var addStylesNode = document.getElementById("deferred-styles");
        var replacement = document.createElement("div");
        replacement.innerHTML = addStylesNode.textContent;
        document.body.appendChild(replacement)
        addStylesNode.parentElement.removeChild(addStylesNode);
    };
    var raf = requestAnimationFrame || mozRequestAnimationFrame ||
        webkitRequestAnimationFrame || msRequestAnimationFrame;
    if (raf) raf(function() {
        window.setTimeout(loadDeferredStyles, 0);
    });
    else window.addEventListener('load', loadDeferredStyles);
</script>