Given the following QML code:

Text {
    //% "<a href=\"http://qt-project.org/\">Qt Project</a>"
    text: qsTrId("qt-project-url")
}

The value assigned to the text property has the backslashes still present:

<a href=\"http://qt-project.org/\">Qt Project</a>

Removing the backslashes from the code results in the following parse error:

Unexpected character in meta string
lupdate warning: Message with id 'qt-project-url' has no source.