"Modal (Pop-up Window)": SugarCube (v2.18)
Summary
This example uses the built-in Dialog object to setup(), add content ( wiki() ), and finally open() the dialog window. SugarCube also comes with additional functionality to adjust other settings.
Live Example
Twee Code
:: StoryTitle
SugarCube: Modal
:: Start
<<link "Open dialog!">>
<<script>>
Dialog.setup("Dialog");
Dialog.wiki("Text within the dialog window");
Dialog.open();
<</script>>
<</link>>
Download: Twee Code