<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
head, style {display: block;}
[contenteditable] {-webkit-user-modify: read-write-plaintext-only;}
style:first-of-type {visibility:hidden;}
style:last-of-type {padding: 20px; font-size: 1.5em; white-space: pre; font-family: monospace; background-color: rgba(255,255,255,0.5);}
html {min-height:100%;}
div {border: 3px solid #ddaa00; padding: 3px; line-height: 2rem;}
div div {border-color: #333;}
div>div {border-style: dotted;}
div:nth-of-type(2){border-styl