These instructions contain specific commands to make the browser perform certain tasks. This is a simple Web page. This is a simple Web page. Not every HTML instruction uses a closing tag, but most do. As a side note, a tag does not have to appear on its own lines.
Tags can share a line with the text they're supposed to modify.
Also, tags are not case sensitive. It doesn't matter whether you use uppercase, lowercase or a combination of both. If you look carefully at the HTML code, you will find that all of the tags for this page have these opening and closing pairs. Everything that appears between an opening and closing tag is affected by the tag. For example, if we wanted to display our sentence in bold-face type, we would add a pair of tags to it.