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<!DOCTYPE html>
<link rel="help" href="https://www.w3.org/TR/1999/REC-xpath-19991116/#predicates">
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function nodesetToSet(result) {
const set = new Set();
for (let node = result.iterateNext(); node; node = result.iterateNext()) {
set.add(node);
}
return set;
}
test(() => {
const doc = document.implementation.createHTMLDocument();
doc.body.innerHTML = '<table></table>' +
'<table><tr><th><th><th><th></table>' +
'<table></table>';
const result = nodesetToSet(doc.evaluate('(//table)[count((//table)[2]/descendant::th)-1]', doc.documentElement));
assert_equals(result.size, 1);
assert_true(result.has(doc.body.lastChild));
}, 'An expression in a predicate should not change the context node');
</script>
</body>
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