How to get graphics that exist in the clipboard through a web page_html/css_WEB-ITnose

For example, I took a screenshot with QQ
and then pressed CTRL V on the web page
and it will automatically paste it


I saw that an editor has already implemented this

http://xheditor.com/demo

I want to know... by what method do they implement it?
HTML5?

Reply to discussion (solution)

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Is xhEditor a new thing?

If you run IE6, it means you are very stressed.

Microsoft has long announced that IE6 is dead. What pressure is there? People who are still using IE6 are stressed. That's right! Under ie6, it feels very stressful

Has this problem been solved? Solutions are urgently needed.