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Google digits

Press 1-9 on Google search page to open the corresponding link

// ==UserScript==
// @name         Google digits
// @description  Press 1-9 on Google search page to open the corresponding link
// @include      https://www.google.tld/*
// @version      1.2.4
// @author       wOxxOm
// @namespace    wOxxOm.scripts
// @license      MIT License
// @run-at       document-start
// @grant        none
// @icon         https://www.google.com/images/branding/googleg/1x/googleg_standard_color_128dp.png
// @noframes
// ==/UserScript==

const SEL = '#rso a h3';
const SEL10 = '#rso > :last-child a h3';
const SELHIDE = '#rso [aria-hidden="true"] a h3';

document.documentElement.appendChild(document.createElement('style')).textContent = /*css*/ `
body {
  counter-reset: digitnav;
}
${SEL}::before {
  counter-increment: digitnav;
  content: counter(digitnav) ":";
  position: absolute;
  margin-left: -1em;
  opacity: .5;
  z-index: 127;
}
${SEL10}::before {
  content: "0:";
}
${SEL}:hover::before {
  opacity: 1;
}
${SELHIDE}::before {
  counter-increment: none !important;
}
`;

addEventListener('keydown', function onKeyDown(e) {
  const k = e.which;
  const digit =
    k >= 48 && k <= 57 ? k - 48 :
    k >= 96 && k <= 105 ? k - 96 :
    -1;
  let el;
  if (digit >= 0 &&
      location.href.match(/[#&?]q=/) &&
      !e.metaKey && !e.ctrlKey &&
      (el = e.target.localName) !== 'input' && (el !== 'textarea')) {
    const elems = [...document.querySelectorAll(SEL)].filter(el => !el.matches(SELHIDE));
    el = elems[digit ? digit - 1 : 9];
    const link = el && el.closest('a');
    if (!link) return;
    removeEventListener('keydown', onKeyDown, true);
    e.stopPropagation();
    el.style.backgroundColor = 'yellow';
    link.focus();
    link.dispatchEvent(new MouseEvent('click',
      e.shiftKey && {shiftKey: true} ||
      e.altKey && {ctrlKey: true} ||
      {}));
  }
}, true);