Modern JavaScript from the Beginning - Second Edition - Get Elements by Tag - jsdom

The video tutorial introduces testing DOM elements using Jest in Node.js. It covers creating a function called getElementsByTag, which retrieves elements by tag name from a root element. The tutorial explains implementing basic checks, handling child nodes recursively, and setting up the Jest environment for testing. It concludes with testing the function and a preview of the next video on finding duplicate IDs.

Explain the role of the 'module.exports' statement in the context of the function.

What are the steps to set up Jest with jsdom for testing?

How does the function 'get elements by tag' ensure it returns the correct elements?

What is the expected output when the root element contains multiple child elements of the same tag?