Perhaps I&#x27;m making my point badly.<p>&gt; The doctype keeps the browser in standards mode<p>Yes, I&#x27;m following that. It keeps it in standards mode because it&#x27;s saying &quot;Hey, this page is HTML5&quot; and browsers can say &quot;Oh good, a modern <i>standards compliant</i> website, this should be just fine&quot;<p>What I mean is that these AMP pages are <i>not</i> valid HTML5. I don&#x27;t like the idea of adding a tag which says &quot;this is valid HTML5&quot; when it isn&#x27;t, <i>just</i> so that there is a side effect of changing the rendering mode that browsers use.