label元素的for属性是否必须引用表单控件错误？

Question

This is driving me crazy. I know its something to do with the label tag. here is my code:

 <form method="post" action="includes/loginprocess.php">
    <label for="username">Username: </label>
    <input type="text" name="username" value=''/>

    <label for="password">Password: </label>
    <input type="password" name="password" />

    <input type="submit" name="submit" value="submit" />
</form>

The for and name are both the same?

The error is "The for attribute of the label element must refer to a form control."

Answer 1

According to http://www.w3schools.com/tags/att_label_for.asp , the value of for attribute of a label should be the id of the element the label is bound to, so add id attribute to the textboxes

<form method="post" action="includes/loginprocess.php">
    <label for="username">Username: </label>
    <input type="text" name="username" id="username" value=''/>

    <label for="password">Password: </label>
    <input type="password" name="password" id="password" />

    <input type="submit" name="submit" value="submit" />
</form>