For the second step in the Shapes section I think change the wording of "Grab the canvas tag out of the DOM" since it implies (in my mind at least) that the DOM is a collection of elements and you're removing an item from that collection.
Instead, I vote for "Create a reference to our canvas tag" or "Use to DOM to get a reference to our canvas tag", something like that.
For the second step in the Shapes section I think change the wording of "Grab the canvas tag out of the DOM" since it implies (in my mind at least) that the DOM is a collection of elements and you're removing an item from that collection.
Instead, I vote for "Create a reference to our canvas tag" or "Use to DOM to get a reference to our canvas tag", something like that.