This is a test case for String.prototype.link(href). On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS '_'.link('"') is "_" PASS '_'.link('b') is "_" PASS '<'.link('b') is "<" PASS '_'.link(0x2A) is "_" PASS '_'.link('"') is "_" PASS '_'.link('" target="_blank') is "_" PASS String.prototype.link.call(0x2A, 0x2A) is "42" PASS String.prototype.link.call(undefined) threw exception TypeError: Type error. PASS String.prototype.link.call(null) threw exception TypeError: Type error. PASS String.prototype.link.length is 1 PASS successfullyParsed is true TEST COMPLETE