JSFiddle - React, Tailwind, and code Playground

HTML

test

JavaScript

jQuery(document).keydown(function(e) {
  if (e.ctrlKey) {
    if (e.keyCode == 65 || e.keyCode == 97) { // 'A' or 'a'
      e.preventDefault();
      // SELECT ALL MARKERS HERE...
    }
  }
});