5c712f2131
Updating the examples to use `let`/`const` should be fine, given that they are available in all browsers/platforms that the PDF.js library now supports; please note the following compatibility information: - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const#browser_compatibility