How are VKontakte emoticons arranged?

Question

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No time to go deep, just curious.
How are VKontakte special characters converted into pictures?
Here, for example, the snowman symbol - ⛄, when inserted anywhere within the VKontakte, instantly turns into a picture
. What is responsible for this?

Answer 1

Yes, in general, just like when copy-pasting a link, its preview appears. The scripts monitor the input box and modify the content as needed.