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These mystery elements were seen by the rendering engine as “unknown elements,” so you were unable to change the way they looked or behaved.
This includes not only our imagined elements, but also any elements that had yet to be defined at the time those browser versions were developed.
In other words, the doctype alone is not going to make your pages HTML5-compliant. In fact, you can use one of those two older doctypes with new HTML5 elements on the page and the page will render the same as it would if you used the new doctype.
Prior to version 9, IE prevented unrecognized elements from receiving styling.
Content is protected by international copyright laws.
As you learn HTML5 and add new techniques to your toolbox, you’re likely going to want to build yourself a boilerplate from which you can begin all your HTML5-based projects.
The doctype should always be the first item at the top of any HTML file.
Many years ago, the doctype declaration was an ugly and hard-to-remember mess.