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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="assert" content="@spellcheck values are ASCII case-insensitive">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
While <div> and <span> aren’t defined as “checkable for the purposes of this
feature”, this has no effect on the attribute’s state.
We wrap the <span> elements under test with <div> elements so the checking
enabled algorithm stops at step 4 (ancestor content attribute), before steps
relying on user-agent-defined behavior (see [#concept-spellcheck-default]).
<div spellcheck="true"><span spellcheck="false"></span></div>
<div spellcheck="true"><span spellcheck="FaLsE"></span></div>
<div spellcheck="true"><span spellcheck="falſe"></span></div>
const span = document.querySelectorAll("span");
test(() => {
assert_equals(span[0].spellcheck, false, "lowercase valid");
assert_equals(span[1].spellcheck, false, "mixed case valid");
assert_equals(span[2].spellcheck, true, "non-ASCII invalid");
}, "keyword false");