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Submitted URL: https://edu.51cto.com/sd/a8a83
Effective URL: https://edu.51cto.com/course/18991.html
Submission: On September 14 via manual from BR
Effective URL: https://edu.51cto.com/course/18991.html
Submission: On September 14 via manual from BR
DOM tree The "DOM" is the Document Object Model