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The main purpose of JavaScript in web browser is to ___________

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The main purpose of JavaScript in web browser is to ___________

(a) Creating animations and other visual effects

(b) User Interface

(c) Visual effects

(d) User experience

I had been asked this question during a job interview.

This question is from Client-Side JavaScript in chapter Document Object Model and Event Handling in Javascript of JavaScript

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Right option is (a) Creating animations and other visual effects

The best I can explain: JavaScript can help to facilitate that experience, for example by:

Creating animations and other visual effects to subtly guide a user and help with page navigation

Sorting the columns of a table to make it easier for a user to find what she needs

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