solution

[Kit3AWP]

- [DEMO LINK](https://Kit3AWP.github.io/js_gallery_DOM/)

[mateacademy-ai-mentor]

Review Summary

I am requesting changes because there are a few issues that can break the gallery behavior or cause tests to fail in realistic page structures. Your overall approach with event delegation and using evt.target.closest('a') is solid, but the implementation is currently a bit too fragile.

• On the line where you set const mainImage = document.querySelector('img');, this will grab the first <img> on the page, which might be a thumbnail rather than the main preview image, so please select the main image via a more specific selector such as document.querySelector('.preview img') or a dedicated class on the main image instead [CHECKLIST ITEM #1].
• On the line where you call container.addEventListener(...) after const container = document.querySelector('.gallery');, there is no check that container was actually found, so you should guard it with something like if (!container) return; before adding the listener to avoid runtime errors when .gallery is missing [CHECKLIST ITEM #4].
• Inside the click handler, when you get the new URL from the thumbnail link, use link.getAttribute('href') instead of link.href so that you preserve the original relative path that the tests are likely asserting against rather than an absolute URL, ensuring the main image src matches expectations [CHECKLIST ITEM #1].

Once you address these points, your gallery code should be both robust and aligned with the task requirements, and the rest of your current solution looks good and on the right track.

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[mateacademy-ai-mentor]

You use document.querySelector('img'), which returns the first in the document. If the first image is a thumbnail, this will update the wrong element. Select the main/preview image explicitly (for example document.querySelector('.preview img') or give the main image a dedicated class) so tests and different DOM orders behave correctly.

[mateacademy-ai-mentor]

There is no check that container exists before calling addEventListener. If .gallery is missing this will throw. Add a guard like if (!container) return; or check before attaching the listener.

[vadiimvooo]

Well done