How Default Browser Styles Affect a Document
Just before we begin building fun projects, you should be aware that your styles aren't the only styles at play. Most browsers have a default implementation control a default set of styles already applied to the HTML elements.
We'll cover the following...
There are way over 40 browsers in the world. I was curious so I checked Wikipedia. Some aren’t popular, but you get the gist.
Your users can be on any browser, and you do not have a control over what browsers they choose to use.
While I would advise that you do not concern yourself with cross-browser issues ...