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ERROR: Ignored call to 'alert()'. The document is sandboxed, and the 'allow-modals' keyword is not set.

Recently I found this issue while writing code snippet in "JSFiddle". And after searching, found this was happening because of new feature added in "Chrome 46+". But at the same time Chrome doesn't have support for "allow-modals" property in "sandbox" attribute.

Chromium issue for above behavior:

To make it work you have to add "allow-scripts allow-modals" in "sandbox" attribute, and use "window.alert" instead of "alert".

<!-- Sandbox frame will execute javascript and show modal dialogs -->

<iframe sandbox="allow-scripts allow-modals" src="iframe.html">


Feature added: Block modal dialog inside a sandboxed iframe.

Feature working Demo page:

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