> Note: it remains the responsibility of the author to know which tags are self-closing. And they should be able to get almost all of the way there by remember

> Note: it remains the responsibility of the author to know which tags are self-closing. And they should be able to get almost all of the way there by remembering one very simple rule: self-closing tags to insert something at that point in the document, open/close tags to describe the content they surround.