Wait... You can add gifs to articles?! didn't know that...
i think you can add anything that html allows you
like this 
but i think you should upload it somewhere not in gamehag
for more information see this link Here
so maybe you ask how to add this on article you can not just write down the code and send the article you have to do it IN THE HTML CODE.
by RightClick on the blank page of article and click on Inspect (Ctrl+Shift+I) and change the HTML.
Wow! this is good. But i cannot add the gif to it!
thanks for the advise, @yazdan. Really useful for people who wanna try out HTML formatted articles.
Thanks a lot yazden. Let me see if it works in here
after leaving a comment and after edit it and use gif
thanks. I didn't know that.
Animation Test
Animation test
It's better to lock the thread now since your question has been answered.
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Can anyone tell me how to add gif images in article? Because when I try to upload one, it says invalid image format.