Start writing your HTML5 page with this “Hello world”. Test your page with validator.w3.org.
Charset is needed for scandics and other special characters.
Short valid HTML page
<!doctype html> <html> <head> <title>Tero's Test Page</title> <meta charset="utf-8" /> </head> <body> <h1>Tero's Test Page</h1> <p>Let's test UTF-8 with "päivää"</p> </body> </html>
If you really wanted, you could make HTML5 pages really short. But that would be ugly:
<!doctype html> <title>Ugly</title> <p>Try it with the validator, if you can't believe it...