Data Exfiltration via CSS + SVG Font - PoC (Safari only)

See:

https://masatokinugawa.l0.cm/2021/11/css-exfiltration-svg-font.html (日本語)
https://mksben.l0.cm/2021/11/css-exfiltration-svg-font.html (English)

You can try it here: https://l0.cm/svg_font/poc.php