HTML code playground isn't working properly

I use freecodecamp in my mobile. I’ve started HTML today. but when I am going to write an h2 element here h is written but 2 isn’t written… Why?

Hello~!

If you are using a mobile device, the default keyboard does not always play well with the freeCodeCamp editor. I recommend you read the article on using a mobile device to view some tips - most importantly, check out the coding keyboards listed as they interface with the editor well.

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Thank you so much for this :heart_eyes: