CSS rulesets
https://developer.mozilla.org/en-US/docs/Web/CSS/Syntax#CSS_rulesets
https://css-tricks.com/css-ruleset-terminology/
.container p:first-child::first-letter {
color: #000;
font-size: 24px;
text-transform: uppercase;
}
http://css.maxdesign.com.au/selectutorial/rule.htm
©xgqfrms 2012-2020
www.cnblogs.com 发布文章使用：只允许注册用户才可以访问！