<!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>