Notes 4.0 (El Capitan) strikethrough option removed
Yeah, the option is a bit well hidden, dunno why.
Its called Struck through  instead of strikethrough

To get the text formatting in Notes 4.0 



1) Make a text selection for the struck through, right click on it

2) Select Fonts then Styles



3) Use the Style Browser or whatever that is called 
to check the Favourite Styles and then select Struck Through from the dropdown list. Tada!



Wow. That was really easy and accessible, right? Why not add 
another step since all that makes a lot of sense. I guess, this time 
Apple struck through the UX. 

Here one close-up of the option. I think one can make a Keyboard 
shortcut that will make this more ehh sane to use. Maybe there is
one already.