Vulnerability Details - Issue: Bypass (1301873) Chrome for Android Hide Custom Fullscreen Toast View with Repeated delayed Enter Fullscreen Request. - Migration Context: Chrome on Android fullscreen toast migrated from native Android toast framework to custom toast view. - Exploitable Behavior: Custom toast view can hide quickly or not display at all using delayed & repeated enter fullscreen requests. - Reference: POC available in attached files and at https://vrphunt.com/chrome/fullscreenpoc.html. Version Affected - Chrome 103.0.5060.70 on Huawei Nova7i; Android 10. Steps to Reproduce 1. Host fullscreenpoc.html on a web server. 2. Click toggle button: color changes from blue to purple. 3. Click again: color changes from purple to green; no toast appears; user enters fullscreen mode and cannot exit until tab is closed and reopened. Credit - Reporter: Ahmed ELMsry.