html5文档声明类型

    1. <!DOCTYPE html>

    html4文档申明类型

    1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Framest//EN>
    2. "http://www.w3.org/TR/html4/framest.dtd">

    html5字符编码

    1. <meta charset="UTF-8">

    html4字符编码

    1. <meta http-equive="Content-Type" content="text/html;charset=utf-8"