Omitting and ending tag like
</h1> makes a mess of the page.
Some browsers center important headings; others do not.
Strictly speaking, whether a heading is centered or not
is a formatting decision and should be left to the browser.
</h1> tags describe the function
of the text they contain.
However, web authors like to have some control over the
presentation of their content.
To center a heading or a paragraph (or anything else) use these tags:
<div align="center"> stuff to be centered </div>
div stands for "division".
align="center" describes what type of division you want.
You can also have
Here is a web page.
div tags to center the heading and the second paragraph.
(Remember that you can use "copy", "cut", and "paste" from the
edit menu of your browser with the text in the box.)