1. br elements must be used only for line breaks that are actually part of the content, as in
   1. poems
   2. addresses
2. br elements must not be used for separating thematic groups in a paragraph
3. While line breaks are usually represented in visual media by physically moving subsequent text to a new line, a style sheet or user agent would be equally justified in causing line breaks to be rendered in a different manner, for instance as green dots, or as extra spacing
4. The wbr element represents a line break opportunity

<p>
    P. Sherman<br>
    42 Wallaby Way<br>
    Sydney
</p>