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<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>window.performance User Timing mark() method is throwing the proper exceptions</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/" /> <link rel="help" href="http://w3c.github.io/user-timing/#dom-performance-mark"/> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="resources/webperftestharness.js"></script> <script> function test_exception(attrName) { test(function () { assert_throws_dom("SyntaxError", function () { window.performance.mark(attrName); }) }, "window.performance.mark(\"" + attrName + "\") throws a SyntaxError exception."); } test(() => { assert_throws_js(TypeError, function() { window.performance.mark(); }); }, 'window.performance.mark() throws a TypeError exception.') // loop through mark scenarios for (var i in timingAttributes) { test_exception(timingAttributes[i]); } </script> </head> <body> <h1>Description</h1> <p>This test validates that the performance.mark() method throws a SYNTAX_ERR exception whenever a navigation timing attribute is provided for the name parameter. </p> <div id="log"></div> </body> </html>