get id javascript

1var element = document.getElementById("YourElementId");

1document.getElementById("YourElementId");

1var element = document.getElementById("oldID");
2element.id = "newID";

1element = document.querySelector("#id");

1var element = document.getElementById("YourElementId");
2var value_element = document.getElementById("YourElementId").value;

1async function test (){
2  document.body.innerHTML = await "<foo id='successGetID'>Hello Wolrd</foo>";
3	var init = await document.getElementsByTagName("foo")[0].id;
4	alert( init );
5}
6test();