This is a very basic implementation of a SKY Add-in using vanilla HTML, CSS, and JavaScript. This add-in includes a simple "Hello World" tile that demonstrates various capabilities of the SKY Add-in framework. It also provides a few examples of launching modal dialogs.
This example references a modal implementated using SKY UX - the source code for the modal is located at https://github.com/blackbaud/skyux-spa-addin-modal-demo.
Finally, a SKY UX version of this sample add-in can be found at https://github.com/blackbaud/skyux-spa-addin-hello-world.
For more information on Blackbaud's SKY Add-in framework, see https://developer.blackbaud.com/skyapi/docs/addins.