MediaWiki:Common.js

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/* Restrict zooming out beyond the initial page size on mobile */
var initialScale = 1;

document.addEventListener('wheel', function(e) {
    if (e.deltaY < 0 && window.innerWidth <= window.screen.width) {
        /* Zoom in */
        initialScale *= 1.1;
    } else if (e.deltaY > 0 && window.innerWidth <= window.screen.width && initialScale > 1) {
        /* Zoom out */
        initialScale /= 1.1;
    }

    updateViewport();
});

function updateViewport() {
    var viewport = document.querySelector("meta[name=viewport]");
    if (viewport) {
        viewport.content = "width=device-width, initial-scale=" + initialScale + ", maximum-scale=1, user-scalable=yes";
    }
}