Not-classic elements don’t work

I was planning on making a template for my website with the new elements Cornerstone implemented. So instead of the now called ‘classic’ elements, I want to use the new elements.

Implementing them into the page works, but when I try to create content in for instance a headline or an image, it doesn’t show up. I made a whole page full of elements, but when I save and look at the examplepage it’s just blank.

Are the new elements not ready for usage yet, which I am not aware of yet? Or can anybody help me?

Thanks in advance.