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export default async function () {
    if ('shadowRoot' in HTMLTemplateElement.prototype === false) {        (function attachShadowRoots (root) {            const templates = root.querySelectorAll('template[shadowroot]');            for (const template of templates) {                const mode = (template.getAttribute('shadowroot') || 'closed');                const shadowRoot = (template.parentNode).attachShadow({ mode });                shadowRoot.appendChild(template.content);                template.remove();                attachShadowRoots(shadowRoot);            }        })(document);    }
    if ('navigation' in window === false) {        // requires the following import map        //<script type="importmap">{"imports":{"abort-controller":"https://cdn.skypack.dev/abort-controller","uuid":"https://cdn.skypack.dev/uuid"}}</script>        window.navigation = new (await import('https://cdn.skypack.dev/@virtualstate/navigation')).Navigation;    }
}