I've got:
HTML:
<div class="article-section">This is the text I want to zoom in to and wrap so it does not go off screen when it reaches a really large font size.</div>
CSS:
article-section {
overflow-y: auto;
-ms-touch-action: pan-x, pinch-zoom;
-ms-touch-action: pan-y, pinch-zoom;
-ms-content-zooming: zoom;
-ms-content-zoom-limit-min: 100%;
-ms-content-zoom-limit-max: 500%;
}