# Optimized for web browser viewing.
if output_type == 'html':
- print("""<html>
+ print("""<!DOCTYPE html>
+<html>
+<head>
<style>
table, tr, th, td { border: 1px solid black; }
.day_row:nth-child(7n+2) { background-color: yellow; }
.district_name { writing-mode: vertical-rl; transform: rotate(180deg); }
-</style><h1>Table of Berlin's Corona infection number development by districts</h1>
+</style>
+<title>Table of Berlin's Corona infection number development by districts</title>
+</head>
+<h1>Table of Berlin's Corona infection number development by districts</h1>
<p>Updated daily at 9pm. <a href="https://plomlompom.com/repos/?p=berlin-corona-table">Source code</a>. <a href="berlin_corona.txt">Text view optimized for terminal curl</a>.</p>
<table>
<tr>