Hi
I’ve made an online tutorial for N5 HTML content. It is quite basic but covers everything in the HTML and CSS part of the course. It has some solutions to help pupils see if they are on the right lines but also would work best with peer assessment/teacher involvement.
https://trinket.io/compscin5/courses/national-5-html
It uses Trinket which is brill for allowing pupils to enter HTML and see results in a quick way.