Unwanted redirect from iframe

Iframe tag allows insert to the webpage content from different URL. Browsers take care about it's isolation to avoid security risks. What a surprise when I experienced, that page in iframe redirects parent window. The evil code which can do that is:

window.top.location = "http://some.url"

Easy way to avoid this behavior is to use HTML5 sandbox attribute. Example:

<iframe height='500px' sandbox='allow-forms allow-scripts' src='http://some.url' width='99.6%'></iframe>

Caveats: sandbox side-effect is also restriction of PDF opening etc. Will be continued:-)

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