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What is the use of invalid selector?

清浅Original: 2019-01-26 11:36:284138browse

The role of the invalid selector is to set a specific style when an illegal value is entered in the form element. The purpose is to remind the user that the entered value is incorrect.

The :invalid selector in CSS is mainly used Sets the specified style when the value in the form element is illegal.

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Example: When the user input is not a legal value, the style will change to a red border

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title></title> 
<style>
input:invalid
{
	border:2px solid red;
}
</style>
</head>
<body>
<input type="email" value="" />

<p>请输入合法 e-mail 地址，查看样式变化。</p>

</body>
</html>

Rendering:

What is the use of invalid selector?

##Note: The :invalid selector only works on elements that can specify interval values, such as the min and max attributes in the input element, the correct email field, legal numeric fields, etc.

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