Please tell me, what language structure is used for the pop-up window structure of QQ and YY? Is html?xml?combined with c c or? _html/css_WEB-ITnose

Please tell me, what language structure is used for the pop-up window structure of QQ and YY? Is html?xml?combined with c c or? Android or Java
If I can modify it myself on the client, if so, what language can I use to modify it? Please advise, I am a newbie, a new programmer

Reply to the discussion (solution)

It is not just a language anymore, the main thing is It's Html, but it needs to be read and called through the client.
Now mobile clients are like this, they cannot do without html, but they do not use html as a framework.