Form items with subfields

IDs used are for example only: they do not affect styling, so use IDs which are appropriate for the application you are building.

Address field

Example Code
Address: 
<!-- START form-item-postal-address component -->
<div class="form-item form-item--postal-address">
    <fieldset>
        <legend>Address:</legend>
        <!-- NB Fields are not definitive: they may change depending on not only the use case but also the country. -->
        <!-- Class names based on http://schema.org/PostalAddress -->
        <div class="form-group form-group--postal-address__street-address">
            <div class="form-item form-item--subfield form-item--postal-address__street-address">
                <label for="text_field_street-address1" class="required">Address line 1</label>
                <input type="text" id="text_field_street-address1" />
            </div>
            <div class="form-item form-item--subfield form-item--postal-address__street-address">
                <label for="text_field_street-address2">Address line 2</label>
                <input type="text" id="text_field_street-address2" />
            </div>
        </div>
        <div class="form-group form-group--postal-address__area">
            <div class="form-item form-item--subfield form-item--postal-address__address-region ">
                <label for="text_field_region">Region</label>
                <input type="text" id="text_field_region" />
            </div>
            <div class="form-item form-item--subfield form-item--postal-address__postal-code">
                <label for="text_field_postcode" class="required">Postcode</label>
                <input type="text" id="text_field_postcode" />
            </div>
            <div class="form-item form-item--subfield form-item--postal-address__address-country">
                <label for="text_field_country" class="required">Country</label>
                <input type="text" id="text_field_country" />
            </div>
        </div>
    </fieldset>
</div>
<!-- END form-item-postal-address component -->

Date field

Example Code
Date of birth
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<!-- START form-item-date component -->
<div class="form-item">
  <fieldset>
    <legend>Date of birth</legend>
    <div class="content-columns content-columns--three-columns content-columns--fixed-columns">
      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
          <label for="day">Day</label>
          <select name="day" id="day">
            <option value="-1" selected="selected" disabled="disabled">DD</option>
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
            <option value="5">5</option>
            <option value="6">6</option>
            <option value="7">7</option>
            <option value="8">8</option>
            <option value="9">9</option>
            <option value="10">10</option>
            <option value="11">11</option>
            <option value="12">12</option>
            <option value="13">13</option>
            <option value="14">14</option>
            <option value="15">15</option>
            <option value="16">16</option>
            <option value="17">17</option>
            <option value="18">18</option>
            <option value="19">19</option>
            <option value="20">20</option>
            <option value="21">21</option>
            <option value="22">22</option>
            <option value="23">23</option>
            <option value="24">24</option>
            <option value="25">25</option>
            <option value="26">26</option>
            <option value="27">27</option>
            <option value="28">28</option>
            <option value="29">29</option>
            <option value="30">30</option>
          </select>
        </div>
      </div>
      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
          <label for="month">Month</label>
          <select name="month" id="month">
            <option value="-1" selected="selected" disabled="disabled">MM</option>
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
            <option value="5">5</option>
            <option value="6">6</option>
            <option value="7">7</option>
            <option value="8">8</option>
            <option value="9">9</option>
            <option value="10">10</option>
            <option value="11">11</option>
            <option value="12">12</option>
          </select>
        </div>
      </div>
      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
          <label for="year">Year</label>
          <select name="year" id="year">
            <option value="-1" selected="selected" disabled="disabled">YYYY</option>
            <option value="2015">2015</option>
            <option value="2014">2014</option>
            <option value="2013">2013</option>
            <option value="2012">2012</option>
            <option value="2011">2011</option>
            <option value="2010">2010</option>
            <option value="2009">2009</option>
            <option value="2008">2008</option>
            <option value="2007">2007</option>
            <option value="2006">2006</option>
            <option value="2005">2005</option>
            <option value="2004">2004</option>
            <option value="2003">2003</option>
            <option value="2002">2002</option>
            <option value="2001">2001</option>
            <option value="2000">2000</option>
            <option value="1999">1999</option>
            <option value="1998">1998</option>
            <option value="1997">1997</option>
            <option value="1996">1996</option>
            <option value="1995">1995</option>
            <option value="1994">1994</option>
            <option value="1993">1993</option>
            <option value="1992">1992</option>
            <option value="1991">1991</option>
            <option value="1990">1990</option>
            <option value="1989">1989</option>
            <option value="1988">1988</option>
            <option value="1987">1987</option>
            <option value="1986">1986</option>
            <option value="1985">1985</option>
            <option value="1984">1984</option>
            <option value="1983">1983</option>
            <option value="1982">1982</option>
            <option value="1981">1981</option>
            <option value="1980">1980</option>
            <option value="1979">1979</option>
            <option value="1978">1978</option>
            <option value="1977">1977</option>
            <option value="1976">1976</option>
            <option value="1975">1975</option>
            <option value="1974">1974</option>
            <option value="1973">1973</option>
            <option value="1972">1972</option>
            <option value="1971">1971</option>
            <option value="1970">1970</option>
            <option value="1969">1969</option>
            <option value="1968">1968</option>
            <option value="1967">1967</option>
            <option value="1966">1966</option>
            <option value="1965">1965</option>
            <option value="1964">1964</option>
            <option value="1963">1963</option>
            <option value="1962">1962</option>
            <option value="1961">1961</option>
            <option value="1960">1960</option>
            <option value="1959">1959</option>
            <option value="1958">1958</option>
            <option value="1957">1957</option>
            <option value="1956">1956</option>
            <option value="1955">1955</option>
            <option value="1954">1954</option>
            <option value="1953">1953</option>
            <option value="1952">1952</option>
            <option value="1951">1951</option>
            <option value="1950">1950</option>
          </select>
        </div>
      </div>
    </div>
    <div class="form-item__description">Esse perferendis voluptatem qui voluptate incidunt error animi.</div>
  </fieldset>
</div>
<!-- END form-item-date component -->

Random field

Example Code
Random field
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Checkboxes (block): 
<div class="form-item">
  <fieldset>
    <legend>Random field</legend>
    <div class="content-columns content-columns--horizontal-padding content-columns--three-columns content-columns--fixed-columns">

      <div class="content-columns__column">
      <!-- START form-item-text_field component -->
<div class="form-item form-item--subfield">
    <label for="text_field">Text field:</label>
    <input type="text" id="text_field" value="Example value" size="">
    <div class="form-item__description">Ut consequatur perferendis vero eaque officia ut est.</div>
</div>
<!-- END form-item-text_field component -->

      </div>

      <div class="content-columns__column">
      <!-- START form-item-select component -->
<div class="form-item form-item--subfield">
    <label for="select_element">Select element:</label>
    <select id="select_element">
        <optgroup label="Option Group 1">
            <option value="1">Option 1</option>
            <option value="2">Option 2</option>
            <option value="3">Option 3</option>
        </optgroup>
        <optgroup label="Option Group 2">
            <option value="1">Option 1</option>
            <option value="2">Option 2</option>
            <option value="3">Option 3</option>
        </optgroup>
    </select>
</div>
<!-- END form-item-select component -->
      </div>

      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
          <fieldset class="form-item__checkboxes form-item__checkboxes--block">
            <legend>Checkboxes (block):</legend>
            <div class="form-item__checkbox">
                <input name="checkbox_button" id="chb_1" value="checkbox_1" type="checkbox">
                <label for="chb_1">Checkbox button 1</label>
            </div>
            <div class="form-item__checkbox">
                <input name="checkbox_button" id="chb_2" value="checkbox_2" type="checkbox">
                <label for="chb_2">Checkbox button 2</label>
            </div>
            <div class="form-item__checkbox">
                <input name="checkbox_button" id="chb_3" value="checkbox_3" type="checkbox">
                <label for="chb_3">Checkbox button 3</label>
            </div>
          </fieldset>
        </div>
      </div>

    </div>
  </fieldset>
</div>

Less random field

Example Code
.content-columns--three-columns
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<div class="form-item">
  <fieldset>
    <legend>.content-columns--three-columns</legend>
    <div class="content-columns content-columns--three-columns content-columns--horizontal-padding content-columns--description">
      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
            <label for="input1">.content-columns__column</label>
            <input type="text" placeholder="33%">
        </div>
      </div>
      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
            <label for="input2">.content-columns__column</label>
            <input type="text" placeholder="33%">
        </div>
      </div>
      <div class="content-columns__column">
        <div class="form-item form-item--subfield">
            <label for="input3">.content-columns__column</label>
            <input type="text" placeholder="33%">
        </div>
      </div>
    </div>
    <div class="form-item__description">Impedit quis optio quia enim ad enim ut esse aspernatur id dolorem.</div>
  </fieldset>
</div>