tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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nested-sandbox.html (240B)

      1 <!DOCTYPE html>
      2 <title>Return fullscreen permissions policy state</title>
      3 <script>
      4  "use strict";
      5  window.onload = () => {
      6    window.parent.postMessage(document.featurePolicy.allowedFeatures().includes("fullscreen"),"*");
      7  };
      8 </script>