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Update 2-ui/99-ui-misc/01-mutation-observer/article.md

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Co-authored-by: Muhammed Zakir <8190126+MuhammedZakir@users.noreply.github.com>
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# Mutation observer
`MutationObserver` is a built-in object that observes a DOM element and fires a callback if there are changes.
`MutationObserver` is a built-in object that observes a DOM element and fires a callback when it detects a change.
We'll first take a look at the syntax, and then explore a real-world use case, to see where such thing may be useful.