Additionally (and I'm NOT an expert at all), wouldn't one often use a class selector to override a paragraph (or other) entity, so even if you DID want different formatting on a paragraph in an Appendix as opposed to the main body you would code
Code:
p {
color: black;
font-size: 1em;
font-style: normal;
font-weight: normal;
text-align: justify;
text-indent: 1.2em;
line-height: 1em;
}
.appendix {
color: red;
}
<p>text in main body</p>
....
<p class="appendix">text in appendix</p>