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POhow to use nth-of-type for classes -- not elements
 

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    <p>I am working on a simple HTML for an image gallery. Each row of the gallery can have 2, 3 or 4 images. (In an 2-image row, each image element is named <code>type-2</code>, the same goes to <code>type-3</code> and <code>type-4</code>.)</p> <p>Now I want to select the last element of each row to set a custom margin. My HTML is like this:</p> <pre><code>&lt;div id="content"&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;!-- I want this, 2n+0 of type-2 --&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;!-- this, 3n+0 of type-3 --&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;!-- this, 4n+0 of type-4 --&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;!-- this --&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;!-- this --&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;!-- this --&gt; &lt;/div&gt; </code></pre> <p>I think the following CSS would work but it didn't:</p> <pre><code>.type-2:nth-of-type(2n+0) {margin-right:0;} .type-3:nth-of-type(3n+0) {margin-right:0;} .type-4:nth-of-type(4n+0) {margin-right:0;} </code></pre> <p>What this CSS selects is:</p> <pre><code>&lt;div id="content"&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;!-- selected by .type-2:nth-of-type(2n+0) --&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;!-- selected by .type-3:nth-of-type(3n+0) --&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;!-- selected by .type-4:nth-of-type(4n+0) --&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;!-- selected by .type-2:nth-of-type(2n+0) --&gt; &lt;div class="type-2"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;!-- selected by .type-3:nth-of-type(3n+0) --&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-3"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;!-- selected by .type-4:nth-of-type(4n+0) --&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;div class="type-4"&gt;&lt;/div&gt; &lt;/div&gt; </code></pre> <p>I can edit my HTML to achieve what I want, but just out of curiosity, is there some kind of CSS for this?</p> <p><strong>Edit:</strong> this question may look like a duplicate of questions asking if <code>nth-child</code> and <code>nth-of-type</code> can be applied to classes -- not elements. I already knew the answer is no. What I'm really asking for is a pure CSS solution/hack for it, and the chosen answer did just that.</p>
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    1. USHoang Huynh
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    1. COYou should just wrap each row in a div.
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      1. USJames Montagne
    2. CO@JamesMontagne and Oriol thank you for pointing out the duplicates, I searched before posting but my keywords were not good enough to reach those questions.
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      1. USHoang Huynh
 

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