Safari Zoom Issue

fix.js

// "Reminder" for mobile Safari to not enable default user scaling. When
// testing a PSPDFKit release we noticed that iOS 12.4.1 on _some_ devices
// (iPhone X) was ignoring the user-scalable part causing it to zoom in
// whenever a node is focused with a below 16px font-size.
//
// We found out that updating the content meta tag's user-scalable part from
// 0 to no (which is equivalent and also supported on iOS) after a bit would
// be enough to get the desired behavior.
setTimeout(function() {
  const viewport = document.querySelector('meta[name="viewport"]');
  viewport.content = viewport.content.replace(
    "user-scalable=0",
    "user-scalable=no"
  );
}, 0);