Tests for .valueAsNumber with . On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS valueAsNumberFor("0") is 0 PASS valueAsNumberFor("0.2") is 0.2 PASS valueAsNumberFor(".2") is 0.2 PASS valueAsNumberFor("10") is 10 PASS valueAsNumberFor("01") is 1 PASS valueAsNumberFor("-0") is 0 PASS valueAsNumberFor("-1.2") is -1.2 PASS valueAsNumberFor("1.2E10") is 1.2E10 PASS valueAsNumberFor("1.2E-10") is 1.2E-10 PASS valueAsNumberFor("1.2E+10") is 1.2E10 PASS valueAsNumberFor("123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789") is 1.2345678901234568E+308 PASS valueAsNumberFor("0.12345678901234567890123456789012345678901234567890") is 0.123456789012345678 valueAsNumber for invalid string values: PASS isNaN(valueAsNumberFor("")) is true PASS isNaN(valueAsNumberFor("abc")) is true PASS isNaN(valueAsNumberFor("0xff")) is true PASS isNaN(valueAsNumberFor("+1")) is true PASS isNaN(valueAsNumberFor(" 10")) is true PASS isNaN(valueAsNumberFor("10 ")) is true PASS isNaN(valueAsNumberFor(".")) is true PASS isNaN(valueAsNumberFor("1E")) is true PASS isNaN(valueAsNumberFor("NaN")) is true PASS isNaN(valueAsNumberFor("nan")) is true PASS isNaN(valueAsNumberFor("Inf")) is true PASS isNaN(valueAsNumberFor("inf")) is true PASS isNaN(valueAsNumberFor("Infinity")) is true PASS isNaN(valueAsNumberFor("infinity")) is true Too huge exponent to support PASS isNaN(valueAsNumberFor("1.2E65535")) is true Tests for the valueAsNumber setter: PASS setValueAsNumberAndGetValue(0) is "0" PASS setValueAsNumberAndGetValue(10) is "10" PASS setValueAsNumberAndGetValue(01) is "1" PASS setValueAsNumberAndGetValue(-0) is "0" PASS setValueAsNumberAndGetValue(-1.2) is "-1.2" PASS setValueAsNumberAndGetValue(1.2e10) is "12000000000" PASS setValueAsNumberAndGetValue(1.2e-10) is "1.2e-10" PASS setValueAsNumberAndGetValue(1.2345678901234567e+308) is "1.2345678901234567e+308" PASS setValueAsNumberAndGetValue("-1.797693134862315e+308") is "-1.797693134862315e+308" PASS setValueAsNumberAndGetValue("-1.797693134862316e+308") threw exception TypeError: Failed to set the 'valueAsNumber' property on 'HTMLInputElement': The value provided is infinite.. PASS setValueAsNumberAndGetValue("1.797693134862315e+308") is "1.797693134862315e+308" PASS setValueAsNumberAndGetValue("1.797693134862316e+308") threw exception TypeError: Failed to set the 'valueAsNumber' property on 'HTMLInputElement': The value provided is infinite.. Tests to set invalid values to valueAsNumber: PASS setValueAsNumberAndGetValue(null) is "0" PASS setValueAsNumberAndGetValue("foo") is "" PASS setValueAsNumberAndGetValue(NaN) is "" PASS setValueAsNumberAndGetValue(Number.NaN) is "" PASS setValueAsNumberAndGetValue(Infinity) threw exception TypeError: Failed to set the 'valueAsNumber' property on 'HTMLInputElement': The value provided is infinite.. PASS setValueAsNumberAndGetValue(Number.POSITIVE_INFINITY) threw exception TypeError: Failed to set the 'valueAsNumber' property on 'HTMLInputElement': The value provided is infinite.. PASS setValueAsNumberAndGetValue(Number.NEGATIVE_INFINITY) threw exception TypeError: Failed to set the 'valueAsNumber' property on 'HTMLInputElement': The value provided is infinite.. PASS successfullyParsed is true TEST COMPLETE