MediaWiki:Upload.js

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document.addEventListener("DOMContentLoaded", function() {
    if (mw.config.get('wgCanonicalSpecialPageName') === 'Upload') {
        var descField = document.getElementById('wpUploadDescription');
        if (descField && descField.value.trim() === "") {
            descField.value = "{{FileSummary\n| description = \n| source = \n| author = \n| license = \n| date = \n}}";
        }
    }
});