tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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subframe-sending-paint.html (468B)

      1 <!DOCTYPE html>
      2 <script>
      3  self.addEventListener('message', function(e) {
      4    // Send paint-timing entries upon receiving a message.
      5    const paintEntries = performance.getEntriesByType('paint');
      6    let entryContents = paintEntries.length + '';
      7    for (let i = 0; i < paintEntries.length; i++) {
      8      const entry = paintEntries[i];
      9      entryContents += ' ' + entry.entryType + ' '  + entry.name;
     10    }
     11    parent.postMessage(entryContents, '*');
     12  });
     13 </script>