javascript get child by id

Question

    Test
    
child

I want to change the style of the child div

Answer 1

This works well:

function test(el){
  el.childNodes.item("child").style.display = "none";
}

If the argument of item() function is an integer, the function will treat it as an index. If the argument is a string, then the function searches for name or ID of element.