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chromium/third_party/blink/web_tests/external/wpt/dom/nodes/Element-setAttribute.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Element.prototype.setAttribute</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-element-setattribute">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
"use strict";

test(() => {

  const el = document.createElement("p");
  el.setAttributeNS("foo", "x", "first");
  el.setAttributeNS("foo2", "x", "second");

  el.setAttribute("x", "changed");

  assert_equals(el.attributes.length, 2);
  assert_equals(el.getAttribute("x"), "changed");
  assert_equals(el.getAttributeNS("foo", "x"), "changed");
  assert_equals(el.getAttributeNS("foo2", "x"), "second");

}, "setAttribute should change the first attribute, irrespective of namespace");

test(() => {
  // https://github.com/whatwg/dom/issues/31

  const el = document.createElement("p");
  el.setAttribute("FOO", "bar");

  assert_equals(el.getAttribute("foo"), "bar");
  assert_equals(el.getAttribute("FOO"), "bar");
  assert_equals(el.getAttributeNS("", "foo"), "bar");
  assert_equals(el.getAttributeNS("", "FOO"), null);

}, "setAttribute should lowercase before setting");
</script>