What is the ID of an element in JavaScript??

Question

Like in
var ob=document.getElementbyId("text");

Answer 1

<p id=text>Text</p>

document.getElementById("text")

(based on what id the developer gives it...)

Answer 2

anything

Answer 3

The 'Text' in paragraph body can be anything or is it supposed to be 'Text' only ?? @ValentinHacker