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Dr Ravi Tomar is currently working as Associate Professor in the School of Computer Science at the University of Petroleum & Energy Studies, Dehradun, India. He is an experienced academician with a demonstrated history of working in the higher education industry. Skilled in Programming, Computer Networking, Stream processing, Python, Oracle Database, C++, Core Java, J2EE, RPA and CorDApp. His research interests include Wireless Sensor Networks, Image Processing, Data Mining and Warehousing, Computer Networks, big data technologies and VANET. He has authored 60+ papers in different research areas, filled four Indian patent, edited 5 books, and have authored 4 books. He has delivered Training to corporates nationally and internationally on Confluent Apache Kafka, Stream Processing, RPA, CordaApp, J2EE and IoT to clients like KeyBank, Accenture, Union Bank of Philippines, Ernst and Young and Deloitte. Dr Tomar is officially recognized as Instructor for Confluent and CordApp. He has conducted various international conferences in India, France and Nepal. He has been awarded a young researcher in Computer Science and Engineering by RedInno, India in 2018, Academic Excellence and Research Excellence Award by UPES in 2021 and conferred by Research Excellence Award 2021 by Hon’ble Chief Minister of Uttarakhand State, India.Ms Sarishma Dangi is currently working in the capacity of Assistant Professor in the Computer Science and Engineering department at Graphic Era University, Dehradun, India. She is a Google Cloud Certified Professional Cloud Architect specialized in the area of virtualization and cloud computing. She is a bright young enthusiast driven towards innovative research work and dedicated to imparting quality education to the higher education industry. She has authored many research papers in recognized journals and has authored a book on "Mobile Cloud Computing: Principles and Paradigms". Her research interests include blockchain, virtualization, vehicular ad-hoc networks and live memory forensics. She is currently pursuing her PhD with full rigour.

• Preface. Acknowledgements. Authors. 1. Introduction. 2. Building the Basics. 3. Objects. 4. Functions. 5. Arrays. 6. Browser Object Model. 7. Document Object Model. 8. Standard Built-In Objects. 9. Validation, Error Handling and Cookies. 10. Miscellaneous Case Studies. References. Index.