MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
$(function() {
    var shortdescText = $('div.shortdescription').text();
    if (shortdescText.length > 0) {
        // Remove the existing meta description generated by MediaWiki
        $('meta[name="description"]').remove();

        // Create a new meta description element
        var meta = document.createElement('meta');
        meta.name = "description";
        meta.content = shortdescText;
        document.getElementsByTagName('head')[0].appendChild(meta);
    }
});