<div class="intro">

<p>This example shows how to create a resizable element where the resize operation is constrained to a specific aspect ratio.</p>

</div>

<div class="example">

{{>constrain-resize-source}}

</div>

<h3>Setting up the Node</h3>

<p>First we need to create an HTML element to make resizable.</p>

```

{{>simple-resize-source-html}}

```

<p>Next, we'll give that element some CSS to make it visible.</p>

```

{{>simple-resize-source-css}}

```

<h3>Setting up the YUI Instance</h3>

<p>Now we need to create our YUI instance and tell it to load the `resize` module. This module is a rollup that includes the `resize-constrain` submodule; that means we have access to the `ResizeConstrained` plugin.</p>

```

YUI().use('resize');

```

<h3>Making the Node resizable</h3>

<p>Now that we have a YUI instance with the `resize` module, we need to instantiate the `Resize` instance on this Node.</p>

```

{{>simple-resize-source-js}}

```

<h3>Adding the Constrained Plugin</h3>

<p>Now we will plug `ResizeConstrained` into our Resize instance. This plugin will allow you to limit the resize dimensions in special ways.</p>

```

{{>constrain-resize-source-js}}

```

<p>In this case, we've used the constraint feature to specify minimum height and width for the element while setting `preserveRatio` to `true`, locking in the original aspect ratio for the element.</p>