This a chrome extension,I just used html,css,and Javascript without any frame.
Simple extension for chrome.
Demo: clone this repo,than unload in chrome
git clone https://github.com/arieslx/screenshot.git
// or download zip
Program function design
There are sth wrong with the cropArea part, I need time to solve it. But in region.js file, you can get the img.src in drawcrop function.
Get a screenshot without other tools.