This page loads pako zlib library (pako_deflate.min.js) to enable compression in the PDF. This is highly recommended as it improves performance and rises the limit on the size of the content that can be exported.

The Standard PDF fonts do not include Unicode support. In order for the output to match what you see in the browser you must provide source files for TrueType fonts for embedding. Please read the documentation about embedding custom fonts and PDF output.