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How can I enter a character using that input source? I tried entering a tab character with +0009, but I didn't get anything. Viceversa, with +9999, I get 香.

Am I doing anything wrong, or doesn't the input source allow to enter control codes?

I tested those codes on Firefox 4.

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Make sure you're using the hex codes for the characters. –  Nathan Greenstein Mar 30 '11 at 23:17
    
The ASCII code for the tab character is 9. –  kiamlaluno Mar 30 '11 at 23:41

2 Answers 2

up vote 3 down vote accepted

You are right by pressing Option ⌥+0009.

My guess would be that Firefox, like many browsers, doesn't like tab characters (especially with forms). Try in TextEdit; it should work there.

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Safari accepts the tab characters entered in that way, but Firefox and Opera seem to not like them. –  kiamlaluno Mar 31 '11 at 6:06
    
Firefox seems to have built its own keyboard input system, as many of the standard OS X key controls don't work properly there, like control-O, control-V, control-Y, and control-T. It's not surprising that Unicode Hex Input doesn't work, either. :-( –  Ken Sep 6 '12 at 18:53

They are Unicode hex codes, see http://unicode.org/

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