### parent(親) > child(子)の使い方

span1
span2
span3

    $("#div1 > span").css("background-color", "#e7f7e7");
    $("#div2 > span").css("background-color", "#e7f7e7");
    $("#div3 > span").css("background-color", "#e7f7e7");

    <div id="div1">
      <span>span1</span>
    </div>
    <div id="div2">
      <div>
        <span>span2</span>
      </div>
    </div>
    <div id="div3">
      <div></div>
      <span>span3</span>
    </div>