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Explicitly describe $ as an alias for jQuery #681

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Explicitly describe $ as an alias for jQuery #681

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2 changes: 2 additions & 0 deletions page/about-jquery/how-jquery-works.md
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Expand Up @@ -53,6 +53,8 @@ $( document ).ready(function() {
});
```

<div class="warning">**Note**: The jQuery library exposes its methods and properties via two properties of the <code>window</code> object called <code>jQuery</code> and <code>$</code>. <code>$</code> is simply an alias for <code>jQuery</code> and it's often employed because it's shorter and faster to write.</div>
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Why should this be in a class="warning" box? Might as well just have a normal paragraph about this. The warnings always give me the feeling something is a gotcha or something could go wrong, but in this case it's just a concept being introduced.

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I feel it doesn't flow well with the rest of the discussion which has another focus, so I put it in a "aside" bar.


For example, inside the `ready` event, you can add a click handler to the link:

```
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