HTML CSS fieldset标签是一个不太常用的表单元素分组标签,其中<legend> 标签为 <fieldset> 元素定义标题,下面是一个简单的HTML fieldset标签使用示例:
<form> <fieldset> <legend>Personalia:</legend> Name: <input type="text"><br> Email: <input type="text"><br> Date of birth: <input type="text"> </fieldset></form>
运行效果如图:

下面是一个比较复杂的fieldset标签使用示例,CSS login登录面板页面设计:
fieldset {
border:none;
margin:0;
}
input {
border:none;
font-family:inherit;
font-size:inherit;
margin:0;
-webkit-appearance:none;
}
input:focus {
outline:none;
}
input[type="submit"] {
cursor:pointer;
}
#login-form {
margin:10px;
width:300px;
border:1px solid #ea6e10;
vertical-align:middle;
border-radius:0px;
}
#login-form h3 {
background-color:#ea6e10;
color:#fff;
font-size:14px;
margin-top:0;
padding:20px;
text-align:right;
}
#login-form fieldset {
background:#fff;
border:1px #ea6e10;
padding:20px;
position:relative;
}
#login-form input {
font-size:14px;
}
#login-form input[type="username"],
#login-form input[type="password"] {
background:#dcdcdc;
padding:12px 10px;
width:100%;
margin-top:5px;
}
#login-form input[type="username"] {
}
#login-form input[type="password"] {
border-radius:0px 0px 3px 3px;
}
#login-form input[type="submit"] {
background:#ea6e10;
text-align:center;
color:#fff;
float:left;
font-weight:bold;
margin-top:5px;
padding:12px 20px;
width:100%;
}
#login-form input[type="submit"]:hover {
background:#ea6e10;
}
.bubble
{
position:relative;
width:250px;
padding:0px;
background:#FFFFFF;
-webkit-border-radius:10px;
-moz-border-radius:10px;
border-radius:10px;
border:#ea6e10 solid 2px;
}
.bubble:after
{
content:'';
position:absolute;
border-style:solid;
border-width:15px 15px 0;
border-color:#FFFFFF transparent;
display:block;
width:0;
z-index:1;
bottom:-15px;
left:136px;
}
.bubble:before
{
content:'';
position:absolute;
border-style:solid;
border-width:16px 16px 0;
border-color:#ea6e10 transparent;
display:block;
width:0;
z-index:0;
bottom:-17px;
left:135px;
}html登录面板代码:
<body> <div id="login-form" class="bubble" style="float:left;"> <h3>Login</h3> <fieldset> <input type="username" required value="username" onBlur="if(this.value=='')this.value='username'" onFocus="if(this.value=='username')this.value='' "> <!-- JS because of IE support; better: placeholder="username" --> <input type="password" required value="Password" onBlur="if(this.value=='')this.value='Password'" onFocus="if(this.value=='Password')this.value='' "> <!-- JS because of IE support; better: placeholder="Password" --> <p><a href="#">Forgot Password?</a></p> <input type="submit" value="Login"> </fieldset> </div> </body>
CSS login登录面板设计,运行效果如图所示:
