<div id="m1">
        <div>내용1_1</div><p>내용1_2</p>
    </div>
    <div id="m2">
        <p>내용2</p>
    </div>
    <div id="m3">
        <span>내용3_1</span><em>내용3_2</em>
    </div>
    <div id="m4">
        <p>내용4</p>
    </div>
  * {
     margin: 5px;
 }
 $(document).ready(function() {
            $("#m1 > div").add("#m1 > p").css("border", "2px solid red")
            $("#m2").children("p").addBack().css("border","2px solid orange");
            $("#m3").find("span").css("border","2px solid yellow").end().find("em").css("border","2px solid green");
            if($("#m4").children().is("p")){
                console.log("p 요소가 존재합니다.");
            }
        });

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js