Just go to this link. https://experiments.withgoogle.com/chrome?tag=WebGL You will see it is like a gallery, select one of them by just clicking the "Overview button" the site looks like this. 
When you click the overview button you will be routed to another page that looks like this.
You will copy that link from the address bar. Notice I encircled it. That is the link that you need to paste here. and Lastly, Click the launch experiment and take screenshots of the graphics that you see. You can just use the Print Screen button on your keyboard, then open Microsoft paint, you can do it by just typing the word paint after clicking the start button. 
Click the paint icon. Then press CTRL + V on your keyboard. Save that file and upload it here.
Please read and review the rules above. I hope this helps.
Excellent! Are you familiar with the snipping tool
in ms windows?
Yes @money-dreamer, I am familiar with that, I am actually using also a third party software called screenpresso when i make a lot of screenshots. I just teach the basic to @kamesh I was on the impression that mspaint is more familiar to a lot number of users.
@jerome-molales thanks you so much. I am am using Snagit to capture image. I use paint method in my window 7, 3 year ago. I want to give you reward by upvote but my upvote is not producing reward because i am new user.
You're welcome! an upvote is still an upvote, it still counts, hehe even if don't have that much of voting weight yet :) I am also new here and still in the process of building steem power. As long as we don't give up on the platform, our vote weight will eventually increase @kamesh, good luck with the contest.
useful guide, thanks
You're welcome @seifanlj. I'm glad that it has been useful to you.
i like it
I'm glad you liked it. :) @abdarmia45