"Now all the faces are placed on top of one another, ready to be rotated. .cubeface--left and .cubeface--right will use rotateX() so they are rotated around the vertical X axis."
should be:
"Now all the faces are placed on top of one another, ready to be rotated. .cubeface--top and .cubeface--bottom will use rotateX() so they are rotated around the vertical X axis."
On the page: https://3dtransforms.desandro.com/cube the following sentence:
"Now all the faces are placed on top of one another, ready to be rotated. .cubeface--left and .cubeface--right will use rotateX() so they are rotated around the vertical X axis."
should be:
"Now all the faces are placed on top of one another, ready to be rotated. .cubeface--top and .cubeface--bottom will use rotateX() so they are rotated around the vertical X axis."
Right?