'TinyMCE - scale entire area (similar to zoom)

I'm trying to scale an entire TinyMCE area (running inside a web-viewer in filemaker).

I can scale wdith/text etc., but inserted images do not scale with the text. What is the best way to scale an entire page, to say ~50% in a similar way to 'zoom' in a web-browser.

This works for me ... but not for images:

<style>
body {
    transform: scale(0.5);
    transform-origin: top left;
}
</style>


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