Round 1: 2 DSA questions and a few questions regarding JS and Programming fundamentals (closure, currying, etc).
Round 2: Questions testing your knowledge regarding HTML/CSS and JS fundamentals. Things like event delegation can be talked about when asked to optimize event handling.
Managerial round: Questions regarding past experience, contribution, work style, etc.
HR round: similar to managerial, but more focused on qualities and company values.