How to get the parent window URL from Iframe?

Question

I know it's a security issue. But is there any way in HTML5. Cause I seen the below code opens a window with the parents URL in tweet box

<iframe src="https://platform.twitter.com/widgets/tweet_button.html"
        style="border: 0; width:130px; height:20px;"></iframe>

Answer 1

Try this inside the iframe. It will alert the parent window's location URL.

alert(document.referrer);