<body>
  <div id="m1">
    <a href="#">내용1_1</a><span>내용1_2</span>
  </div>
  <div id="m2">
    <div>
      <a href="#">내용2_1</a><span>내용2_2</span>
    </div>
  </div>
  <div id="m3">
    <div><span>내용3_1</span></div>
  </div>
  <div id="m4">
    <span class="m">내용4_1</span>
    <span>내용4_2</span>
    <span>내용4_3</span>
    <em>내용4_4</em>
  </div>
  <div id="m5">
    <span class="m">내용5_1</span>
    <span>내용5_2</span>
    <span>내용5_3</span>
  </div>
  <div id="m6">
    <div><span>내용6_1</span></div>
    <div>내용6_2</div>
  </div>
</body>
* {
  margin: 5px;
}
$(document).ready(function() {
  $("#m1").children().css("border", "2px solid red");
  $("#m2").children().children("span").css("border", "2px solid orange");
  $("#m3 span").closest("div").css("border", "2px solid yellow");
  $("#m4 > span.m").nextUntil("em").css("border", "2px solid green");
  $("#m5 > span").filter(".m").css("border", "2px solid blue");
  $("#m6 > div").has("span").css("border", "2px solid navy");
})

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.1/jquery.min.js