tmp

dist/index.html

@@ -2,11 +2,14 @@
   // Block rendering until we ensure DOCTYPE is present
   if (document.doctype === null) {
     const doctypeNode = document.implementation.createDocumentType('html', '', '');
-    if (document.firstChild) {
-      document.insertBefore(doctypeNode, document.firstChild);
-    } else {
-      document.appendChild(doctypeNode);
-    }
+    document.insertBefore(doctypeNode, document.documentElement || document.firstChild);
+    // Force browser to reparse in standards mode
+    const htmlElement = document.documentElement;
+    const newHtmlElement = htmlElement.cloneNode(true);
+    htmlElement.parentNode.replaceChild(newHtmlElement, htmlElement);
+    // Force a reflow
+    void document.body.offsetWidth;
+    console.log('DOCTYPE is present');
   }
   else {
     console.log('DOCTYPE is present');