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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<meta name="assert" content="@contenteditable values are ASCII case-insensitive">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div contenteditable="false"></div>
<div contenteditable="FaLsE"></div>
<div contenteditable="falſe"></div>
<div></div>
<script>
const div = document.querySelectorAll("div");
test(() => {
assert_equals(div[0].contentEditable, "false", "lowercase valid");
assert_equals(div[1].contentEditable, "false", "mixed case valid");
assert_equals(div[2].contentEditable, "inherit", "non-ASCII invalid");
assert_throws_dom("SyntaxError", () => {
div[3].contentEditable = "falſe";
}, "non-ASCII rejected by IDL");
}, "keyword false");
</script>