How to detect if site/page is single page application?

Usually disable JS. The page won't exist if you do

usually if something doesnt work, then it is a SPA

Click a link and see if it loads a new page.

@itsdaniel0 it does if it's well done.

Thanks guys but i was asking more with the code or human less ways of it :). Please keep sharing ideas also here is mine; declare a variable from console and load another page or click to menu if variable is still declared its SPA.