226641 2021-06-04 05:26:34 -0700 CountQueuingStrategy.constructor misses checking if the init.highWaterMark is exist or not 2021-06-11 05:27:19 -0700 1 1 1 Unclassified WebKit WebCore Misc. WebKit Local Build Unspecified Unspecified NEW InRadar P2 Normal --- 1 zyscoder webkit-unassigned bugs-noreply calvaris cdumez mcatanzaro sam webkit-bug-importer youennf oldest_to_newest 1766742 0 zyscoder 2021-06-04 05:26:34 -0700 Steps to reproduce: (1) Open a tab and navigate to any URL; (2) Run one of the following codes in the Console of Devtools: ``` new CountQueuingStrategy({highWaterMark:undefined}) / new CountQueuingStrategy({}) ``` (3) Then this code would be evaluated successfully without throwing any exception. Actual results: This code is evaluated successfully without throwing any exception. Expected results: As the spec(https://streams.spec.whatwg.org/#dictdef-queuingstrategyinit) says, CountQueuingStrategy.constructor asks a double value as its init.highWaterMark param. Thus these codes should throw an exception. In my test, both Chrome and Firefox throw exceptions: Chrome: `VM1491:1 Uncaught TypeError: Failed to construct 'CountQueuingStrategy': required member highWaterMark is undefined.` Firefox: `Uncaught TypeError: 'highWaterMark' must not be undefined` 1768912 1 webkit-bug-importer 2021-06-11 05:27:19 -0700 <rdar://problem/79193758>