一、鼠标悬浮时，字体颜色从左到右依次变化
<!DOCTYPE html><html><head> ???<meta charset="utf-8"> ???<title>box-size</title> ???<style type="text/css"> ???????h1{ ???????????letter-spacing: 100px;/*必要*/ ???????????position: relative;/*必要*/ ???????????cursor: pointer; ???????????list-style-type: none; ???????} ???????h1:before{ ???????????content: attr(title);/*必要*/ ???????????width: 0%;/*必要*/ ???????????position: absolute;/*必要*/ ???????????z-index: 2;/*必要*/ ???????????color: #e49d99; ???????????white-space: nowrap; ???????????overflow: hidden;/*必要*/ ???????????transition: 3s;/*必要*/ ???????} ???????h1:hover:before{ ???????????width: 100%;/*必要*/ ???????} ???</style></head><body> ???<h1 title="ABCDABCD">ABCDABCDE</h1></body></html>
CSS 字体hover特效
原文地址：https://www.cnblogs.com/potatog/p/9298061.html