Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.
(This answer only applies to Chrome Developer Tools. See update below.) Find an element that contains the disappearing element. Right click on the element and a
T. Ugawa, S. Marr, and R. Jones. Proceedings of the 14th ACM SIGPLAN International Workshop on Virtual Machines and Intermediate Languages, page 11. ACM, (Dec 5, 2022)