Authoring accessible Web forms http://blog.chrisdpeters.com/authoring-accessible-web-forms/

bad-form.html

<form action="action.cfm" method="post">
    <p>
        <strong>Your Name</strong><br />
        <input type="text" name="yourName" />
    </p>
    <p>
        <strong>Gender</strong><br />
        <input type="radio" name="gender" value="M" />
        Male<br />
        <input type="radio" name="gender" value="F" />
        Female
    </p>
    <p>
        <input type="submit" value="Submit" />
    </p>
</form>

fieldsets.html

<form action="action.cfm" method="post">
    <div>
        <label for="your-name">Your Name</label><br />
        <input id="your-name" type="text" name="yourName" />
    </div>
    <fieldset>
        <legend>Gender</legend>
        <input id="gender-m" type="radio" name="gender" value="M" />
        <label for="gender-m">Male</label><br />
        <input id="gender-f" type="radio" name="gender" value="F" />
        <label for="gender-f">Female</label>
    </fieldset>
    <div>
        <input type="submit" value="Submit" />
    </div>
</form>

form-div.css

form div {
    margin: 10px 0;
}

labels.html

<form action="action.cfm" method="post">
    <div>
        <label for="your-name">Your Name</label><br />
        <input id="your-name" type="text" name="yourName" />
    </div>
    <div>
        <strong>Gender</strong><br />
        <input id="gender-m" type="radio" name="gender" value="M" />
        <label for="gender-m">Male</label><br />
        <input id="gender-f" type="radio" name="gender" value="F" />
        <label for="gender-f">Female</label>
    </div>
    <div>
        <input type="submit" value="Submit" />
    </div>
</form>

replace-p-with-div.html

<form action="action.cfm" method="post">
    <div>
        <strong>Your Name</strong><br />
        <input type="text" name="yourName" />
    </div>
    <div>
        <strong>Gender</strong><br />
        <input type="radio" name="gender" value="M" />
        Male<br />
        <input type="radio" name="gender" value="F" />
        Female
    </div>
    <div>
        <input type="submit" value="Submit" />
    </div>
</form>