Don't use IDs in selectors

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Hi,



I was just trying IDs on the CSS tab and I noticed that a little warning sign appeared "Don't use IDs in selectors"



Why does the CSS tap recomend me not to use IDs in selectors?. Is there something wrong about them? (the selector seems to work perfectly).



Please help....



I didn't find the right solution from the Internet.


References

www.codecademy.com/en/forum_questions/50b26dcfa6e5461b2a0003b9


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