All about (CUSTOM ELEMENT)

References:- https://web.dev/custom-elements-v1/ <my-element> <div class="my_class">hello1</div> <div class="my_class">hello 2</div> </my-element> <my-element> <div class="my_class">hello1</div> <div class="my_class">hello 2</div> </my-eleme...