Make iframe automatically adjust height according to the contents without using scrollbar? [duplicate]

Question 1

For example:

<iframe name="Stack" src="https://stackoverflow.com/" width="740"
        frameborder="0" scrolling="no" id="iframe"> ...
</iframe>

I want it to be able to adjust its height according to the contents inside it, without using scroll.

Question 2

Add this to your <head> section:

<script>
  function resizeIframe(obj) {
    obj.style.height = obj.contentWindow.document.documentElement.scrollHeight + 'px';
  }
</script>

And change your iframe to this:

<iframe src="https://stackoverflow.com/questions/9975810/..." frameborder="0" scrolling="no" onload="resizeIframe(this)" />

As found on sitepoint discussion.

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