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https://www.w3docs.com/snippets/css/how-to-scale-the-content-of-iframe-element.html
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#your-frame {
width: 1920px;
height: 1080px;
}
#your-frame {
zoom: 0.50;
-moz-transform: scale(0.50);
-moz-transform-origin: 0 0;
-o-transform: scale(0.50);
-o-transform-origin: 0 0;
-webkit-transform: scale(0.50);
-webkit-transform-origin: 0 0;
}
@media screen and (-webkit-min-device-pixel-ratio:0) {
#your-frame {
zoom: 1;
}
}