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Firefox on Android actually has a great error message here:

> Nightly Can’t Open This Page

> To protect your security, www.w3.org will not allow Nightly to display the page if another site has embedded it. To see this page, you need to open it in a new window.

> Learn more…[1]

> [Open Site in New Window]

[1]: Links to https://support.mozilla.org/en-US/kb/xframe-neterror-page

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Oh my god! You must be very confused now, being told an error message, and some detail about it.

Dear end-user, do you need therapy? I'll make sure that message is removed in the next release, so other end-users are not subjected to such horribly frightening information.

Chrome shows the following:

> Refused to frame 'https://www.w3.org/' because an ancestor violates the following Content Security Policy directive: "frame-ancestors 'self' https://cms.w3.org/".

It only shows that in the console for me. The rendered error page just says 'www.w3.org refused to connect.'

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