Why, sir, can you have two IDs on the button with the same ID="loginbtn" without reporting an error?

Question

<div class="layui-form-item" id="loginbtn">    <button  class="layui-btn" lay-filter="save" lay-submit="" type="button" id="loginbtn">        登 录    </button></div>

Answer 1

No error will be reported if the program repeats the ID. The same page ID is not repeated, it is just a rule that everyone follows, which is convenient for yourself and others