document get element byid code example

Example 1: document get element by tag

var list = document.getElementsByTagName("UL")[0];
list.getElementsByTagName("LI")[0].innerHTML = "Milk";

Example 2: how to use document.getelementbyid

<p id="YourId">How to use document.GetElementById in HTML</p>
<script>
document.GetElementById('YourId')./* The thing you need to do to your code... Here I want .innerHTML you can take any...  */.innerHTML('/* what will it change... */')
</script>