Update README.md

README.md

@@ -25,5 +25,3 @@ Safari (Webkit) >= 3
 Special behaviour for Firefox which decided to prevent dialog with onbeforeunload event : https://developer.mozilla.org/en-US/docs/Web/API/window.onbeforeunload
 
 <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/"><img alt="Licence Creative Commons" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" /></a><br /><span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">crossbrowser-onbeforeunload</span> est mis à disposition selon les termes de la <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">licence Creative Commons Attribution - Pas d’Utilisation Commerciale - Partage dans les Mêmes Conditions 4.0 International</a>.
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-<iframe src="http://google.fr/" width="200px" height="200px"></iframe>