<!DOCTYPE html>
<link rel="help" href="https://www.w3.org/TR/1999/REC-xpath-19991116/#function-substring-before">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="helpers.js"></script>
<body>
<div id="context"></div>
<script>
test(() => {
  const context = document.querySelector('#context');
  context.innerHTML = '<span>^^^bar$$$</span><span>bar<b>$</b></span><b>bar</b>';
  assert_equals(evaluateString('substring-before((./span)[1], ./b)', context), '^^^');
}, 'substring-before() arguments depending on the context node');
</script>
</body>