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update to reflect the fact that console has spec #1382

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update to reflect the fact that console has spec #1382

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4 changes: 1 addition & 3 deletions async & performance/ch1.md
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Expand Up @@ -96,9 +96,7 @@ Any time you wrap a portion of code into a `function` and specify that it should

### Async Console

There is no specification or set of requirements around how the `console.*` methods work -- they are not officially part of JavaScript, but are instead added to JS by the *hosting environment* (see the *Types & Grammar* title of this book series).

So, different browsers and JS environments do as they please, which can sometimes lead to confusing behavior.
The `console.*` methods are not officially part of JavaScript, but are instead added to JS by the *hosting environment* (see the *Types & Grammar* title of this book series). Despite having a standard specification, different browsers and JS environments do as they please, which can sometimes lead to confusing behavior.

In particular, there are some browsers and some conditions that `console.log(..)` does not actually immediately output what it's given. The main reason this may happen is because I/O is a very slow and blocking part of many programs (not just JS). So, it may perform better (from the page/UI perspective) for a browser to handle `console` I/O asynchronously in the background, without you perhaps even knowing that occurred.

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