Highlight text on selection

What is the markup for highlighting/selecting the text of a TextInput when we tap on it so when we start typing it will replace its contents?

Are you talking about placeholder text? If so: did you look at the documentation for TextInput? https://www.fusetools.com/docs/fuse/controls/textinput

<TextInput ux:Name="text" PlaceholderText="Text field" PlaceholderColor="#ccc"> for example.

No, when TextInput has a value (not placeholder), I wanted to automatically select all the text when tapped to edit. Currently it will (at least in Preview) will set the cursor to the location of the tap but I wanted to also select all the text