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Focus in an iframe with Javascript does not work in Firefox

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giwayume
giwayume
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Does firefox not allow Javascript to manipulate focus inside of an iframe? Cross domain or not?

If I try to focus inside an input in an iframe on Firefox, nothing happens but it works in every other web browser.

Here is a very simple jsfiddle that does not work in Firefox because the preview pane is an iframe: http://jsfiddle.net/4b32fgd8/

Does firefox not allow Javascript to manipulate focus inside of an iframe? Cross domain or not? If I try to focus inside an input in an iframe on Firefox, nothing happens but it works in every other web browser. Here is a very simple jsfiddle that does not work in Firefox because the preview pane is an iframe: http://jsfiddle.net/4b32fgd8/