Editing Troubleshooting of selenium errors (section)

== How to resolve the selenium errors ==

* Checking the standalone selenium server is running or not {{kbd | key=<nowiki>ps aux | grep selenium</nowiki>}} on {{Linux}}
* Checking the log file of standalone selenium server e.g. launching the server by the command {{kbd | key=<nowiki>sudo nohup java -jar selenium-server-standalone-3.141.59.jar > /home/user/selenium.log 2>&1 &</nowiki>}}. The log file was located at {{kbd | key=<nowiki>/home/user/selenium.log</nowiki>}}
* (optional) Checking the port where the selenium server is running e.g. {{kbd | key=<nowiki>wget http://localhost:4444</nowiki>}}
* Checking the error log file of HTTP server e.g. {{kbd | key=<nowiki>sudo tail /var/log/nginx/error.log</nowiki>}}
* (optional) Checking the error log file of PHP-FPM e.g. {{kbd | key=<nowiki>sudo tail /var/log/www.access.log</nowiki>}} which its file path defined in the configuration file {{kbd | key=<nowiki>/etc/php-fpm.d/www.conf</nowiki>}}
* (optional) Checking the keyboard event e.g. CTRL works on {{Win}} but not works on {{Mac}}<ref>[https://stackoverflow.com/questions/30937153/selenium-send-keys-what-element-should-i-use python - Selenium - send keys - what element should I use - Stack Overflow]</ref>