# TextFormat.underline

#### Availability

Flash Player 6.

#### Usage

    my_fmt.underline

#### Description

Property; a Boolean value that indicates whether the text that uses this text format is underlined (`true`) or not (`false`). Note that this is the same underline accomplished by the `<U>` tag, but the latter is not "true" underlining, because it does not skip descenders correctly. The default value is `null`, which indicates that the property is undefined.