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Submitted URL: https://www.nap.edu/read/11612/chapter/4#43
Effective URL: https://nap.nationalacademies.org/read/11612/chapter/4
Submission: On December 15 via api from UA — Scanned from PL
Effective URL: https://nap.nationalacademies.org/read/11612/chapter/4
Submission: On December 15 via api from UA — Scanned from PL
DOM tree The "DOM" is the Document Object Model