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Reference another property value from the same containing block.

Restricted to referencing properties that don't already reference other properties.

this( property-name, fallback )


  • property-name Property name
  • fallback A CSS value


The referenced property value, or the fallback if it has not been set.


.foo {
  width: this( height );
  height: 100em;

/* The following both fail because they create circular references. */
.bar {
  height: this( width );
  width: this( height );