Easy DOM Question 65 of 229

What does event.preventDefault do?

Frontend Master · Speak this in 60–90 seconds · Faridabad & Delhi NCR

PICTURE THIS: DOM IS A TREE

html

headbody

navmainfooter

Simple meaning

It stops the browser's default action, like following a link or submitting a form.

WHY — DOM instead of guessing?

Why interviewers care about DOM:

DOM questions separate people

who only read docs from people who shipped.

Keep it short, concrete,

and tied to Frontend work.

Stay structured

Name the idea, why it exists, then one short example.

Close cleanly

End with when you use it and one common pitfall.

STEPS — What happens step by step?

Before you speak the answer, walk the interviewer through these steps:

1
It stops the browser's
default action, like following a link or submitting a form.
2
I use it in
React onSubmit so I can validate and call fetch instead of a full page reload.
3
How it works
It does not stop bubbling
4
Give an example
that is stopPropagation.
5
Common mistake
What juniors usually get wrong.
6
Close
When you pick this over the alternative.

EXAMPLE — See it in action

Here's a short line you can speak, broken into clear beats:

Say this line

“I use it in React onSubmit so I can validate and call fetch instead of a full pa”

Break into beats

IuseitinReactonSubmit

Speaking order

2987408337471632900

Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.

Key takeaway

It stops the browser's default action, like following a link or submitting a form. I use it in React onSubmit so I can validate and call fetch instead of a full page reload.