Installation :
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Download Selenium from official website : https://www.seleniumhq.org/download/
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Start the selenium server :
java -jar seleniumjar.jar
or
java -jar seleniumjar.jar -port 4545
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To launch Selenium in hub mode, type these commands :
java -jar (path/to/)selenium-server-standalone-2.53.1.jar -role hub java -jar (path/to/)selenium-server-standalone-2.53.1.jar -role node -nodeConfig (path/to/)DefaultNode.json