I recently put out a new video course at Learn Construct 2. This video is an add on to that course showing how to create a local top 10 high score table using webstorage and arrays.
Please note, this video was taken as part of a full course on making an infinite flyer game. Whenever you see int(timer) in the video, just treat that as your score variable. In the course we used a timer as a means of keeping score.
Also, since this is part of a full course, I can't offer up the CAPX. Maybe in the future I will do a stand alone tutorial on making a high score table.