代码示例:(标识:eg_html_input_attributes_size)
<!DOCTYPE html>
<html>
<body>

<form action="">
First name:<br>
<input type="text" name="firstname" value ="Bill" size="40">
<br>
Last name:<br>
<input type="text" name="lastname">
</form>

</body>
</html>
运行结果: