How to add Shortcode (font awesome) in widget title?

I checked your code in my install. It works, except that you made a typo (missing backslash):

[icon]cog[/icon]

Few notes:

  • You must make sure to enqueue the Font Awsesome stylesheet.

  • You must close the shortcode, like: [icon]cog[/icon]

  • Remember to escape the class name with esc_attr().

  • Another shortcode idea: [fa icon="cog"]

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