MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
// Find the existing viewport meta tag
var viewportMeta = document.querySelector('meta[name="viewport"]');

// If it exists, change its content
if (viewportMeta) {
    viewportMeta.setAttribute('content', 'width=device-width, initial-scale=1.0');
} else {
    // If there's no existing viewport meta tag, create a new one and append it to the head
    var newViewportMeta = document.createElement('meta');
    newViewportMeta.name = "viewport";
    newViewportMeta.content = "width=device-width, initial-scale=1.0";
    document.head.appendChild(newViewportMeta);
}