Creating a chrome extension which takes highlighted text on the page and inserts it into a textarea in popup.html

Question

I have spent several hours searching the web for solutions. What I would like to do is take the highlighted text on a page and transfer it to a textarea in the popup.html of

Answer 1

popup.js

chrome.tabs.executeScript( {
  code: "window.getSelection().toString();"
}, function(selection) {
  alert(selection[0]);
});

manifest.json

"permissions": [
    "activeTab",
],

Have a look at this simple extension https://github.com/kelly-apollo/zdic