tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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when-defined-reentry-crash.html (795B)

      1 <!DOCTYPE html>
      2 <meta charset="utf-8">
      3 <title>Check for crashes when a whenDefined promise resolving re-entries</title>
      4 <meta name="author" href="mailto:xiaochengh@chromium.org">
      5 <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-api">
      6 <link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1366813">
      7 <script>
      8 class CustomElement extends HTMLElement {}
      9 
     10 Object.prototype.__defineGetter__("then", main);
     11 
     12 let depth = 0;
     13 function main() {
     14  if (depth > 1) return;
     15  ++depth;
     16  customElements.whenDefined("custom-a"); // Causes re-entry of main()
     17  try { customElements.define("custom-a", CustomElement) } catch (e) {}
     18  customElements.whenDefined("custom-b");
     19  --depth;
     20 }
     21 
     22 main();
     23 </script>
     24 
     25 Test passes if it does not crash.