MediaWiki:Gadget-copyCode.js

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(function($) {
    console.log('Gadget loaded');
    $('code').each(function() {
        var $code = $(this);
        if ($code.parents('pre, .mw-highlight').length === 0) {
            $code.after('<button class="code-copy-button">Test</button>');
        }
    });
})(jQuery);