Opera 9.5(Presto 2.1) support table claims support for this, but support tables for Presto 2.1.1 up to 2.5 indicate that this property is not supported.
Opera 9.5（Presto 2.1）支持此功能，但Presto 2.1.1至2.5的支持表格表明该属性不被支持。