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chromium/third_party/blink/web_tests/external/wpt/dom/nodes/Text-wholeText.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Text - wholeText</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-text-wholetext">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
"use strict";

test(() => {
  const parent = document.createElement("div");

  const t1 = document.createTextNode("a");
  const t2 = document.createTextNode("b");
  const t3 = document.createTextNode("c");

  assert_equals(t1.wholeText, t1.textContent);

  parent.appendChild(t1);

  assert_equals(t1.wholeText, t1.textContent);

  parent.appendChild(t2);

  assert_equals(t1.wholeText, t1.textContent + t2.textContent);
  assert_equals(t2.wholeText, t1.textContent + t2.textContent);

  parent.appendChild(t3);

  assert_equals(t1.wholeText, t1.textContent + t2.textContent + t3.textContent);
  assert_equals(t2.wholeText, t1.textContent + t2.textContent + t3.textContent);
  assert_equals(t3.wholeText, t1.textContent + t2.textContent + t3.textContent);

  const a = document.createElement("a");
  a.textContent = "I'm an Anchor";
  parent.insertBefore(a, t3);

  const span = document.createElement("span");
  span.textContent = "I'm a Span";
  parent.appendChild(document.createElement("span"));

  assert_equals(t1.wholeText, t1.textContent + t2.textContent);
  assert_equals(t2.wholeText, t1.textContent + t2.textContent);
  assert_equals(t3.wholeText, t3.textContent);
}, "wholeText returns text of all Text nodes logically adjacent to the node, in document order.");
</script>