- begin on a new line
- space between selector and opening curly brace
- closing curly brace, unindented, on its own line
selector {
property: value;
}
<!DOCTYPE html>
We use HTML 5 standards, and an excellent reference is available at http://html5boilerplate.com/ (click on "Download Boilerplate" on the left and view source of index.html to see the comments).