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1: https://www.examveda.com/all-elements-are-identified-by-their-and-are-marked-up-using-either-start-tags-and-end-tags-or-self-closing-tags-39484/
2: https://www.sanfoundry.com/html-questions-answers-quiz/
3: https://brainly.in/question/16662758
4: https://dev.w3.org/html5/html-author/
5: https://en.wikipedia.org/wiki/HTML_element
6: https://html.spec.whatwg.org/
7: https://www.tutorialrepublic.com/html-tutorial/html-elements.php
8: https://books.google.com/books?id=1-EDAAAAMBAJ&pg=PA15&lpg=PA15&dq=1.+All+elements+are+identified+by+their%0Aand+are+marked+up+using+either+start+tags+and+end+tags+or+self-closing+t.%0Aa)+attribute+name%0Ab)+tag+name%0Ac)+class+name%0Ad)+none+of+the+mentioned&source=bl&ots=r3hp5blGkg&sig=ACfU3U1uplLXVLoEbJ_GtzcwT1T6pKY1Qw&hl=en&sa=X&ved=2ahUKEwi3-tGP0czyAhUzPn0KHYUKBVwQ6AF6BAg3EAM
9: https://www.oreilly.com/library/view/learning-web-design/9781449337513/ch04.html
10: https://www.oreilly.com/library/view/creating-a-website/9781449374525/ch01.html
11: https://digital.com/tools/html-cheatsheet/