This is barely even an issue at all, but I like using Firefox’s “reader view” tool to follow coding tutorials. One thing I’ve noticed is that the code blocks use the pre element, but it doesn’t include a nested code element. The reader view will apply special formatting to these elements to improve readability. From what I can tell the single line code fragments are using the code element, so it’s only the mult-line code blocks that lack the element.
Without code element (left), with code element (right):