You can find v2 of the HTML5 / CSS3 slides at https://chris.lu/html5.
Use the arrow keys (Up / Down / Left and Right) to navigate through the slides. A lot of slides have "sub slides", that you can access by pressing the down button. The arrows display in the bottom right, on any slide, show you if you can move down on a given slide. Press [ESC] to enter the slide overview. The overview helps you to quickly navigate through the slides.
If you want to fork the slides, you can find them in my GitHub repository.
If you find inaccuracies or bugs in the slides, please report them in the comments section below this article.