(function (window) {
    'use strict';

    var document = window.document;
    var documentElement = document.documentElement;

    if (documentElement && 'object' === typeof documentElement && 1 === documentElement.nodeType) {
        documentElement.setAttribute('data-script-enabled', 'true');
    }

    // HACK: 念のためガベージコレクトを明示
    documentElement = null;
}(this));