dom - javascript selectors

Question

How does one select DOM elements in javascript?
Like for example:

<div class="des">
    <h1>Test</h1>
        <div class="desleft">
          <p>Lorem Ipsum.</p>
        </div>
        <div class="Right">
           <button>Test</button>
        </div>
</div>

Now how do i select h1? This is just a part of a bigger Page, so cannot use getElementsByTagName(), since others might get selected. Also since there might be other h1's in the document later, i cannot attach the index(body's) to above.

Is there a simple way to select, say <h1> tag which is under the classname of desleft? I cannot use jQuery or any other libraries.

Answer 1

You can use this to get to your H1:

var des = document.getElementsByClassName('des')
var fc = des[0].getElementsByTagName('h1')
alert(fc[0].innerHTML)