ResizeObserver and MutationObserver
Comes up in: Web fundamentals
This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.
What it covers
- element size changes vs window resize
- ResizeObserver loop errors
- MutationObserver options (childList, attributes, subtree)
- MutationObserver uses microtasks
Words you will know
What you will practise
- auto-sizing textarea
- watch DOM changes
Interview questions this answers
- When would you use MutationObserver?