setTimeout and setInterval's second param is required? if not, what is the default value?

Question

setTimeout(function(){...}, 100);

my question is can I remove 100 completely? If yes, what is the default value setTimeout receive in all modern browsers?

I had researched in 4 documents but can't find any for my question

w3schools says it is required but mozilla is not required and default value is 0, msdn and nodejs have nothing :)

Answer 1

As per the non normative W3C Recommendation ( http://www.w3.org/TR/html5/webappapis.html#dom-windowtimers-settimeout )

handle = window.setTimeout( handler [, timeout [, arguments... ] ] )

handle = window.setInterval( handler [, timeout [, arguments... ] ] )

The 2nd argument (timeout) is optional and

5. Let timeout be the second method argument, or zero if the argument was omitted.

the default value is 0.

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However do note that

Note: Timers can be nested; after five such nested timers , however, the interval is forced to be at least four milliseconds.