In HTML5, you can use the readonly attribute to set a read-only and unchangeable tag. This attribute is used to set the specified tag field to be read-only. It can be selected and copied but cannot be modified. The syntax is "readonly="readonly "".
The operating environment of this tutorial: Windows 10 system, HTML5 version, Dell G3 computer.
html5How to set a read-only tag that cannot be changed
The readonly attribute specifies that the input field is read-only.
Read-only fields cannot be modified. However, users can still tab to the field and select or copy its text.
The readonly attribute prevents users from modifying the value until certain conditions are met (such as a checkbox being selected). Then, you need to use JavaScript to eliminate the readonly value and switch the input field to an editable state.
The readonly attribute can be used with or .
The example is as follows:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<p>Country:<input type="text" name="country"
value="China" readonly="readonly" /></p>
</body>
</html>Output result:
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