[bhhaskin]

You shouldn't be using IDs anyways. They are just bad for a lot of reasons. You can only have one on a page and it reduces your reusability. Use classes instead.

[err4nt]

ID's aren't bad, they're unique identifiers, and useful for (deep) linking to specific pieces of content within documents. Please use ID's as liberally as you please, and use them for their proper use.

[goatlover]

Use ids when JS needs to reference unique elements. Use classes for styling and accessing groups.

[isleyaardvark]

JS can do just as well with unique classnames, which avoids issues with ids like those given in the article.

[sgc]

I always presumed this would usually entail a performance hit, since you are accessing something that is not defined as unique.

[isleyaardvark]

It's an infinitesimal performance decrease, and it avoids a lot of other issues.