How to access HTML element without ID?

Question

For instance in the snippet below - how do I access the h1 element knowing the ID of parent element (header-inner div)?

 
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Answer 1

If you are sure that there is only one H1 element in your div:

var parent = document.getElementById('header-inner');
var element = parent.GetElementsByTagName('h1')[0];

Going through descendants,as Shog9 showed, is a good way too.