1<!--{
2
3"title": "this()"
4
5}-->
6
7Reference another property value from the same containing block.
8
9Restricted to referencing properties that don't already reference other properties.
10
11<code>this( *property-name*, *fallback* )</code>
12
13## Parameters
14
15* *`property-name`* Property name
16* *`fallback`* A CSS value
17
18## Returns
19
20The referenced property value, or the fallback if it has not been set.
21
22## Examples
23
24```css
25.foo {
26  width: this( height );
27  height: 100em;
28}
29```
30
31********
32
33```css
34/* The following both fail because they create circular references. */
35.bar {
36  height: this( width );
37  width: this( height );
38}
39```
40