用css画一个如下图的提示框：
代码如下：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>Title</title> ???<style> ???????.dialog{ ???????????display:inline-block; ???????????padding:10px; ???????????border-radius: 4px; ???????????z-index: 2000; ???????????font-size: 12px; ???????????border:1px solid #303133; ???????????position: relative; ???????????top: 30px; ???????????left:50px; ???????} ???????.dialog .dialog_ico{ ???????????position: relative; ???????????top: -31px; ???????} ???????.dialog_ico:after,.dialog_ico:before{ ???????????content:‘‘; ???????????display:block; ???????????position:absolute; ???????????border-style:solid; ???????????border-width:10px; ???????} ???????.dialog_ico:before{ ???????????border-color:black transparent transparent ?transparent; ???????????left:20px; ???????????top:42px; ???????} ???????.dialog_ico:after{ ???????????border-color:#fff transparent transparent ?transparent; ???????????left:20px; ???????????top:41px; ???????} ???</style></head><body> ???<div class="dialog"> ???????<span class="dialog_text">这是提示框</span> ???????<div class="dialog_ico"></div> ???</div></body></html>css画一个提示框
原文地址：https://www.cnblogs.com/fangnianqin/p/9909105.html