In HTML5, you can start the first line with a nice, easy-to-remember doctype:
I consider the above line the greatest improvement in HTML5.
The doctype is a web standard requirements and it tells the browser that the document should be processed using HTML5 standards.
Here is a sample HTML5 template:
<!DOCTYPE html> <html> <head lang='en'> <meta charset='UTF-8'> <title></title> </head> <body> </body> </html>
You can always base your HTML5 page on the above template.