Detailed explanation of examples of UI element status pseudo-class selectors in css3-CSS Tutorial-php.cn

This article mainly introduces the UI element status pseudo-class selector of CSS3, including hover, active and focus, enabled, disabled read-only and read-write, etc. Friends who need it can refer to it

The so-called UI selector: The specified style only works when the element is in a certain state, and does not work in the default state!

Browser compatibility:

E:hover Support firefox, safari, Opera, ie8, chrome ------------
E:active Support firefox , safari, Opera, chrome Does not support ie8
E:focus Supports firefox, safari, Opera, ie8, chrome -------------
E:enabled Supports firefox, safari, Opera , chrome Does not support ie8
E:disabled Supports firefox, safari, Opera, chrome Does not support ie8
E:read-only Supports firefox, Opera Does not support ie8, safari, chrome
E:read-write Supported Firefox, Opera do not support IE8, Safari, Chrome
E: Checked support Firefox, Safari, Opera, Chrome does not support IE8
E :: SELECTION support Firefox, Safari, Opera, Chrome does not support ie8
E: default only supports firefox chrome does not support ie8
E:valid supports firefox, safari, Opera, chrome does not support ie8
E:required supports firefox, safari, Opera, chrome Does not support ie8
E:optional Supports firefox, safari, Opera , chrome Does not support ie8
E:in-range Supports firefox, safari, Opera, chrome Does not support ie8
E:out-of-rang Supports firefox, safari, Opera, chrome Does not support ie8
The following is Detailed description of its use;

1. Selectors E:hover, E:active and E:focus
1). The E:hover selector is used to specify when the mouse pointer moves to The style used by the element when the element is on
Usage method:
:hover{
CSS Style
}
We can use the "< element >" to add the type attribute of the element.
Example:
input[type="text"]:hover{
CSS style
}
2). The E:active selector is used to specify the style used when the element is activated.
3). The E:focus selector is used to specify the style used by the element to obtain the cursor focus. It is mainly used when the text box control obtains the focus and performs text input.

For example:

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>选择器E:hover、E:active和E:focus</title>  
    <style>  
        input[type="text"]:hover{  
            background: green;  
        }  
        input[type="text"]:focus{  
            background: #ff6600;  
            color: #fff;  
        }  
        input[type="text"]:active{  
            background: blue;  
        }  
        input[type="password"]:hover{  
            background: red;  
        }  
    </style>  
</head>  
<body>  
<h1>选择器E:hover、E:active和E:focus</h1>  
<form>  
    姓名：<input type="text" placeholder="请输入姓名">  
    <br/>  
    <br/>  
    密码：<input type="password" placeholder="请输入密码">  
</form>  
</body>  
</html>

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2. E:enabled pseudo-class selector and E:disabled pseudo-class selector
1). The E:enabled selector is used to specify the style when the element is in the available state.
2). The E:disabled selector is used to specify the style when the element is in a disabled state.

For example:

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>E:enabled伪类选择器与E:disabled伪类选择器</title>  
    <style>  
        input[type="text"]:enabled{  
            background: green;  
            color: #ffffff;  
        }  
        input[type="text"]:disabled{  
            background: #727272;  
        }  
    </style>  
</head>  
<body>  
<h1>E:enabled伪类选择器与E:disabled伪类选择器</h1>  
<form>  
    姓名：<input type="text" placeholder="请输入姓名" disabled>  
    <br/>  
    <br/>  
    学校：<input type="text" placeholder="请输入学校">  
</form>  
</body>  
</html>

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3. E:read-only pseudo-class selector and E:read-write Pseudo-class selector
1). The E:read-only selector is used to specify the style when the element is in a read-only state.
2). The E:read-write selector is used to specify the style when the element is in a non-read-only state.

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>read-only伪类选择器与E:read-write伪类选择器</title>  
    <style>  
        input[type="text"]:read-only{  
            background: #000;  
            color: green;  
        }  
        input[type="text"]:read-write{  
            color: #ff6600;  
        }  
    </style>  
</head>  
<body>  
<h1>read-only伪类选择器与E:read-write伪类选择器</h1>  
<form>  
    姓名：<input type="text" placeholder="请输入姓名" value="winson" readonly>  
    <br/>  
    <br/>  
    学校：<input type="text" placeholder="请输入学校">  
</form>  
</body>  
</html>

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4. Pseudo-class selectors E: checked, E: default and indeterminate
1), E The :cehcked pseudo-class selector is used to specify the style when the radio radio button or checkbox in the form is in the selected state.
2). The E:default selector is used to specify the style of the radio button or check box control that is in the selected state by default when the page is opened.
3). The E:indeterminate selector is used to specify the style of the entire group of radio button boxes when no single radio button box in a group of radio button boxes is set to the selected state when the page is opened.

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>checked伪类选择器</title>  
    <style>  
        input[type="checkbox"]:checked{  
            outline: 2px solid green;  
        }  
    </style>  
</head>  
<body>  
<h1>checked伪类选择器</h1>  
<form>  
    房屋状态：  
    <input type="checkbox">水  
    <input type="checkbox">电  
    <input type="checkbox">天然气  
    <input type="checkbox">宽带  
</form>  
</body>  
</html>

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Default selection

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>default伪类选择器</title>  
    <style>  
        input[type="checkbox"]:default{  
            outline: 2px solid green;  
        }  
    </style>  
</head>  
<body>  
<h1>default伪类选择器</h1>  
<form>  
    房屋状态：  
    <input type="checkbox" checked>水  
    <input type="checkbox">电  
    <input type="checkbox">天然气  
    <input type="checkbox">宽带  
</form>  
</body>  
</html>

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<h1 style="color: rgb(0, 0, 0); font-family: Simsun; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px;">indeterminate伪类选择器</h1><!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>indeterminate伪类选择器</title>  
    <style>  
        input[type="radio"]:indeterminate{  
            outline: 2px solid green;  
        }  
    </style>  
</head>  
<body>  
<h1>indeterminate伪类选择器</h1>  
<form>  
    性别：  
    <input type="radio">男  
    <input type="radio">女  
</form>  
</body>  
</html>

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5. Pseudo-class selector E::selection
1). The E:selection pseudo-class selector is used to specify the style when the element is selected.

For example

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>伪类选择器E::selection</title>  
    <style>  
        ::selection{  
            background: green;  
            color: #ffffff;  
        }  
        input[type="text"]::selection{  
            background: #ff6600;  
            color: #ffffff;  
        }  
    </style>  
</head>  
<body>  
<h1>伪类选择器E::selection</h1>  
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<input type="text" placeholder="文本">  
</body>  
</html>

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6. E:invalid pseudo-class selector and E:valid pseudo-class selector
1). The E:invalid pseudo-class selector is used to specify the style when the element content cannot pass the check specified by HTML5 using attributes such as requirede of the element or the element content does not conform to the format specified by the element.
2). The E:valid pseudo-class selector is used to specify the style when the element content can pass the check specified by HTML5 by using attributes such as requirede of the element or when the element content conforms to the format specified by the element.

For example

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>E:invalid伪类选择器与E:valid伪类选择器</title>  
    <style>  
        input[type="email"]:invalid{  
            color: red;  
        }  
        input[type="email"]:valid{  
            color: green;  
        }  
    </style>  
</head>  
<body>  
<h1>E:invalid伪类选择器与E:valid伪类选择器</h1>  
<form>  
    <input type="email" placeholder="请输入邮箱">  
</form>  
</body>  
</html>

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7. E:required pseudo-class selector and E:optional pseudo-class selector
1). The E:required pseudo-class selector is used to specify the styles of input elements, select elements, and textarea elements that are allowed to use the required attribute and have specified the required attribute.
2). The E:optional pseudo-class selector is used to specify the style of input elements, select elements and textarea elements that are allowed to use the required attribute and the required attribute is not specified.

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>E:required伪类选择器与E:optional伪类选择器</title>  
    <style>  
    input[type="text"]:required{  
        background: red;  
        color: #ffffff;  
    }  
        input[type="text"]:optional{  
            background: green;  
            color: #ffffff;  
        }  
    </style>  
</head>  
<body>  
<h1>E:required伪类选择器与E:optional伪类选择器</h1>  
<form>  
    姓名：<input type="text" placeholder="请输入姓名" required>  
    <br/>  
    <br/>  
    学校：<input type="text" placeholder="请输入学校">  
</form>  
</body>  
</html>

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8. E:in-range pseudo-class selector and E:out-of-range pseudo-class selector
1). The E:in-range pseudo-class selector is used to specify the style when the effective value of the element is limited to a range and the actual input value is within this range.
2). The E:out-of-range pseudo-class selector is used to specify the style to be used when the effective value of the element is limited to a range, but the actual input value exceeds it.

For example

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title>E:in-range伪类选择器与E:out-of-range伪类选择器</title>  
    <style>  
        input[type="number"]:in-range{  
            color: #ffffff;  
            background: green;  
  
        }  
        input[type="number"]:out-of-range{  
            background: red;  
            color: #ffffff;  
        }  
    </style>  
</head>  
<body>  
<h1>E:in-range伪类选择器与E:out-of-range伪类选择器</h1>  
<input type="number" min="0" max="100" value="0">  
</body>  
</html>

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