The formatting category includes the following blocks:

The code block starts with
<!-- wp:code -->
<?php echo 'Hello World'; ?>

The classic block can have almost anything in it.

a heading

The preformatted block.

The Road Not Taken

Robert Frost 
Two roads diverged in a yellow wood,
And sorry I could not travel both          (\_/)  
And be one traveler, long I stood         (='.'=)  
And looked down one as far as I could     (")_(")  
To where it bent in the undergrowth; 

Then took the other, as just as fair,  
And having perhaps the better claim,          |\_/|  
Because it was grassy and wanted wear;       / @ @ \  
Though as for that the passing there        ( > º < )  
Had worn them really about the same,         `>>x<<´  
                                             /  O  \  
And both that morning equally lay  
In leaves no step had trodden black.  
Oh, I kept the first for another day!  
Yet knowing how way leads on to way,  
I doubted if I should ever come back.  
I shall be telling this with a sigh  
Somewhere ages and ages hence:  
Two roads diverged in a wood, and I—  
I took the one less traveled by,  
And that has made all the difference.  



and here's a line of some really, really, really, really long text, just to see how it is handled and to find out how it overflows;

The Verse block

A block for haiku? 
  Why not? 
    Blocks for all the things!