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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Element.prototype.hasAttribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<span data-e2="2" data-F2="3" id="t"></span>
<script>
"use strict";
test(() => {
const el = document.createElement("p");
el.setAttributeNS("foo", "x", "first");
assert_true(el.hasAttribute("x"));
}, "hasAttribute should check for attribute presence, irrespective of namespace");
test(() => {
const el = document.getElementById("t");
assert_true(el.hasAttribute("data-e2"));
assert_true(el.hasAttribute("data-E2"));
assert_true(el.hasAttribute("data-f2"));
assert_true(el.hasAttribute("data-F2"));
}, "hasAttribute should work with all attribute casings");
</script>