Minimal HTML5 standard skeleton

<!DOCTYPE html>
<html lang="en">
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1"/>

    <link rel="stylesheet" href="assets/styles/screen.css"/>
    <link rel="icon" href="favicon.ico"/>
<script src="assets/scripts/page.js"></script>

Meta Tags

Prevent robots from crawling and indexing

<meta name="robots" content="noindex, nofollow" />

Allowed chars in HTML-ids

id and name tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

See also: Content-Security-Policy