自动对焦当通过Ajax加载时,HTML5的属性不仅适用于FireFox.为什么

<form action="client_entry_action.php" method="post" id="client_entry_form" name="client_entry_form">

<fieldset id="client_info_1">

    <label for="c_name">Name:</label> 
    <input type="text" name="c_name" required placeholder="Name" autofocus="autofocus" />

    <label for="c_phone">Phone Number:</label> 
    <input type="tel" name="c_phone" required placeholder="Mobile/Phone Number" />

    <label for="c_email">Email:</label> 
    <input type="email" name="c_email" required placeholder="email@example.com" />

    <label for="c_address">Address:</label> 
    <textarea name="c_address" ></textarea>


</fieldset>

<fieldset id="client_info_2">   

    <label for="c_info">Additional notes:</label> 
    <textarea name="c_info" ></textarea>

    <input type="submit" name="add_client" value="Add Client" />

</fieldset>        

</form>