Form submission refresh page does not jump source code design

Form submission refresh page does not jump source code design
1. Design source code

Copy code
The code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Form submission page does not jump</title>
</head>
<body>
<form action="" id="" method="post" target="id_iframe">
<input type="text" id="input_text" name="input_text"/>
<input type="submit" id="sobmit" name="submit" value="Submit" />
</form>
<iframe id="id_iframe" name="id_iframe" style="display:none;"></iframe>
</body>
</html>

2. Operation results

(1) Enter "451" and click "Submit"

(2) Enter "45464646" and click "Submit"

Page submission refresh, no jump

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