show selected text in textarea && activeElement
function onMouseUp(e) {
const activeTextarea = document.activeElement;
const selection = activeTextarea.value.substring(
activeTextarea.selectionStart, activeTextarea.selectionEnd
);
const outputElement = document.getElementById('output-element');
const outputText = document.getElementById('output-text');
outputElement.innerHTML = activeTextarea.id;
outputText.innerHTML = selection;
}
const textarea1 = document.getElementById('ta-example-one');
const textarea2 = document.getElementById('ta-example-two');
textarea1.addEventListener('mouseup', onMouseUp, false);
textarea2.addEventListener('mouseup', onMouseUp, false);