文档介绍：<html><head><title>WEBDesign</title><styletype="text/css">*{margin:0auto;width:600px;font-family:Arial;}#header{margin:0auto;height:60px;width:600px;font-size:25px;vertical-align:middle;color:skyblue;}#nav{height:30px;background:skyblue;}a{float:left;display:block;width:120px;font-size:17px;padding-left:4px;color:white;text-align:center;vertical-align:middle;font-style:bold;padding-top:7px;}a:link{text-decoration:none;}a:hover{background:gray;}p{font-size:25px;padding-top:10px;padding-bottom:10px;}.int{font-size:17px;text-indent:2em;word-space:1px;font-style:normal;font-weight:normal;}table,th,td{border:3pxsolidblack;margin-top:10px;border-collapse:collapse;text-align:center;}th{width:600px;height:30px;}</style></head><body><divid="header"><strong>WEBDESIGN<strong></div><divid="nav"><divclass="navs"><ahref="#">HOME</a></div><div><ahref="#">HTML</a><divclass="navs"><ahref="#">CSS</a></div><divclass="navs"><ahref="#">JavaScript</a></div></div><p>Introduction</p><hrwidth:100%/><pclass="int">;interfacedesign;authoring,includingstandardisedcodeandproprietarysoftware;userexperiencedesign;