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    <p>You're using the rails <a href="http://api.rubyonrails.org/classes/ActionView/Helpers/CaptureHelper.html#method-i-capture" rel="nofollow">capture helper</a> but your syntax is wrong. I don't know why it's printing out <code>one</code>. In rails 3.4 it doesn't print out anything.</p> <p>Here's the right way to use it</p> <pre><code>&lt;% @number = capture do %&gt; three &lt;% end %&gt; this is some html and here is my &lt;%= @number %&gt; </code></pre> <p>The html that will be rendered is</p> <pre><code>this is some html and here is my three </code></pre> <p>Since your syntax is wrong I wouldn't worry about why "one" is showing up. Instead I'd focus more on using the capture helper correctly.</p> <p><hr /> <strong>Edit:</strong></p> <p>Your second (edited) example is not the same as your first one. Here it is with line numbers and a slight change to the last line so you can see what's going on.</p> <pre><code>1. &lt;% my_string = "" %&gt; 2. &lt;% my_string &lt;&lt; capture do %&gt; 3. Hello 4. &lt;% end %&gt; 5. before &lt;%= my_string %&gt; after </code></pre> <p>The result is <code>Hello before Hello after</code>. So line 3 is being rendered, then line 5 is being rendered with <code>my_string</code> containing the value <code>Hello</code>.</p> <p>If you change it to this</p> <pre><code> &lt;% my_string = "" %&gt; &lt;% my_string = capture do %&gt; &lt;!-- changed &lt;&lt; to = --&gt; Hello &lt;% end %&gt; before &lt;%= my_string %&gt; after </code></pre> <p>Then the result is <code>before Hello after</code>.</p> <p>So what does this all mean? When you use <code>&lt;&lt;</code> it's screwing up the <code>capture</code> method and it's rendering stuff that's inside the capture block even though normally you don't expect it to.</p> <p>Basically, you can't do what you're trying to do here, at least not with your current syntax.</p>
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    1. POWhy is Rails' ERB rendering output from this template code?
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    1. POWhy is Rails' ERB rendering output from this template code?
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    1. COYeah, I am actually appending the return value of capture to another string, but I omitted that detail in order to simplify my example.
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    2. COHave you tried the exact erb you posted in rails 3.0.3?
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    3. COI updated my original post with a better example. And yes, I've tried both.
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