Recently, technologies of web applications and web browser are becoming more complex, which causes different issues on different web browsers. Although there are many cross-browser detection tools on the market, all of them mainly focus on the front-end, and they are lack of detection on web page exploring and cross-browser issues detecting. The purpose of this research is to track the web applications structure and find their cross-browser issues. This research first defines and classifies cross-browser issues, purposes the browser debugger XB-tester, collects data through cross-browser crawling technologies, and finally analyzes cross-browser issues and displays error reports. Web developers can use this tool to effectively reduce the human cost to achieve cross-browser automation testing purposes.