Description

• For security reasons, we execute delete window.webkit.messageHandlers and then immediately WebKit would restore the original, so we could use it securely.
• On iOS 18, it seems it does NOT restore immediately anymore, but rather after some arbitrary time-frame.

Chrome does the same thing:

 function sendWebKitMessage(handlerName, message) {
      try {
          // A web page can override `window.webkit` with any value. Deleting the
          // object ensures that original and working implementation of
          // window.webkit is restored.
          var oldWebkit = window.webkit;
          delete window['webkit'];
          window.webkit.messageHandlers[handlerName].postMessage(message);
          window.webkit = oldWebkit;
      }
      catch (err) {
          // TODO(crbug.com/40269960): Report this fatal error
      }
  }

and it's also broken.

Steps to reproduce

1. Visit https://www.atgtickets.com/shows/cabaret/kit-kat-club-at-the-playhouse/calendar/
2. Page won't load

Actual result

• Page doesn't load at all

Expected result

• Page should load

Reproduces how often

Easily reproduced

Brave version

• All

Device/iOS version

• All

Affected browser versions

• latest AppStore
• latest TestFlight
• previous TestFlight

Reproducibility

• with Brave Shields disabled
• in the latest version of mobile Safari

Miscellaneous information

No response