[css] How to select the first, second, or third element with a given class name?

This isn't so much an answer as a non-answer, i.e. an example showing why one of the highly voted answers above is actually wrong.

I thought that answer looked good. In fact, it gave me what I was looking for: :nth-of-type which, for my situation, worked. (So, thanks for that, @Bdwey.)

I initially read the comment by @BoltClock (which says that the answer is essentially wrong) and dismissed it, as I had checked my use case, and it worked. Then I realized @BoltClock had a reputation of 300,000+(!) and has a profile where he claims to be a CSS guru. Hmm, I thought, maybe I should look a little closer.

Turns out as follows: div.myclass:nth-of-type(2) does NOT mean "the 2nd instance of div.myclass". Rather, it means "the 2nd instance of div, and it must also have the 'myclass' class". That's an important distinction when there are intervening divs between your div.myclass instances.

It took me some time to get my head around this. So, to help others figure it out more quickly, I've written an example which I believe demonstrates the concept more clearly than a written description: I've hijacked the h1, h2, h3 and h4 elements to essentially be divs. I've put an A class on some of them, grouped them in 3's, and then colored the 1st, 2nd and 3rd instances blue, orange and green using h?.A:nth-of-type(?). (But, if you're reading carefully, you should be asking "the 1st, 2nd and 3rd instances of what?"). I also interjected a dissimilar (i.e. different h level) or similar (i.e. same h level) un-classed element into some of the groups.

Note, in particular, the last grouping of 3. Here, an un-classed h3 element is inserted between the first and second h3.A elements. In this case, no 2nd color (i.e. orange) appears, and the 3rd color (i.e. green) shows up on the 2nd instance of h3.A. This shows that the n in h3.A:nth-of-type(n) is counting the h3s, not the h3.As.

Well, hope that helps. And thanks, @BoltClock.

_x000D_
_x000D_
div {_x000D_
  margin-bottom: 2em;_x000D_
  border: red solid 1px;_x000D_
  background-color: lightyellow;_x000D_
}_x000D_
_x000D_
h1,_x000D_
h2,_x000D_
h3,_x000D_
h4 {_x000D_
  font-size: 12pt;_x000D_
  margin: 5px;_x000D_
}_x000D_
_x000D_
h1.A:nth-of-type(1),_x000D_
h2.A:nth-of-type(1),_x000D_
h3.A:nth-of-type(1) {_x000D_
  background-color: cyan;_x000D_
}_x000D_
_x000D_
h1.A:nth-of-type(2),_x000D_
h2.A:nth-of-type(2),_x000D_
h3.A:nth-of-type(2) {_x000D_
  background-color: orange;_x000D_
}_x000D_
_x000D_
h1.A:nth-of-type(3),_x000D_
h2.A:nth-of-type(3),_x000D_
h3.A:nth-of-type(3) {_x000D_
  background-color: lightgreen;_x000D_
}
_x000D_
<div>_x000D_
  <h1 class="A">h1.A #1</h1>_x000D_
  <h1 class="A">h1.A #2</h1>_x000D_
  <h1 class="A">h1.A #3</h1>_x000D_
</div>_x000D_
_x000D_
<div>_x000D_
  <h2 class="A">h2.A #1</h2>_x000D_
  <h4>this intervening element is a different type, i.e. h4 not h2</h4>_x000D_
  <h2 class="A">h2.A #2</h2>_x000D_
  <h2 class="A">h2.A #3</h2>_x000D_
</div>_x000D_
_x000D_
<div>_x000D_
  <h3 class="A">h3.A #1</h3>_x000D_
  <h3>this intervening element is the same type, i.e. h3, but has no class</h3>_x000D_
  <h3 class="A">h3.A #2</h3>_x000D_
  <h3 class="A">h3.A #3</h3>_x000D_
</div>
_x000D_
_x000D_
_x000D_

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