Took me a while to understand, maybe some images are required..

e.g. "Instead of [screenshot of Characters page in a browser window] -> text: click a character -> [screenshot of the blank browser window with caption "navigation, full page fetch and rendering"]-> [screenshot of a character modal in a browser window]

You get: [screenshot of Characters page in a browser window] -> text: click a character -> [screenshot of a character modal in browser window with caption: Swup/Fragment Plugin handles the loading and rendering of the modal, making your website an SPA]"