Implement Document.getElementsByClassName

[codler]

Can we add Document.getElementsByClassName?

Currently Im doing this workaround to polyfill getElementsByClassName

const patchDoc = doc => {
  doc.getElementsByClassName = search => {
    const results = [];
    const elements = doc.getElementsByTagName('*');
    const pattern = new RegExp(`(^|\\s)${search}(\\s|$)`);
    for (let i = 0; i < elements.length; i++) {
      if (pattern.test(elements[i].getAttribute('class'))) {
        results.push(elements[i]);
      }
    }
    return results;
  };
  return doc;
}

const doc = patchDoc(new DOMParser().parseFromString(html));

[kethinov]

I'm for it. PR would be welcome.