Comment #5 on issue 2218 by [email protected]: HTML extensions to
String.prototype must throw an error if the `this` object is not coercible
(i.e. `null` or `undefined`)
http://code.google.com/p/v8/issues/detail?id=2218
However, the change that is being proposed here are not part of the ecma
spec and not yet mature.
FWIW, http://mathias.html5.org/specs/javascript/ includes it, and so does
the latest ES6 spec draft (see
http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts) — see
step 1 of the abstract operation `CreateHTML`.
I haven't checked this yet, but other browsers might not even comply with
the suggested behavior either.
Safari/JavaScriptCore, Chrome/V8, and IE/Chakra don’t perform the
CheckObjectCoercible step:
* Safari/JavaScriptCore: https://bugs.webkit.org/show_bug.cgi?id=64677
* IE/Chakra: https://connect.microsoft.com/IE/feedback/details/752807
Firefox and Opera do. As errors are thrown in these browsers, it’s unsafe
to use these methods with `null` or `undefined` anyway, so it makes sense
to do the same for all browsers/engines.
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