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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: eventDispath how that work
Date: Thu, 16 Oct 2014 02:48:56 +0200
Organization: PointedEars Software (PES)
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Joao Rodrigues wrote:

> On 15/10/2014 18:02, Thomas 'PointedEars' Lahn wrote:
>> Correction: The latter would be equivalent to
>> 
>> document.querySelectorAll(".foo")
>> 
>> Instead,
>> 
>> document.getElementsByClassName("foo")[0]
>> 
>> would be equivalent to the former, provided that the method returned
>> a reference to an object implementing the NodeList or HTMLCollection
>> interface (which would need to be tested before the “0” property read
>> access).
> 
> Pardon me, but these methods are not equivalent because:
> 
> a) The getElementsByClassName() method returns a live NodeList whereas
> querySelectorAll() returns a static NodeList;

ACK.
 
> b) The getElementsByClassName() method excludes any elements that are
> not descendants of the HTMLElement object on which the method was
> invoked.

Your logic is flawed.  getElementsByClassName() was not invoked on an object 
implementing the HTMLElement interface here; it was invoked on an object 
implementing the (HTML)Document interface.  That is a separate method, as 
even your own references say.

> […]
> var div = document.getElementById("bar");
> var p = div.querySelector("body p");

So this example does not apply here in two respects:

  1. another method
  2. another selector

> <http://www.w3.org/TR/2008/WD-html5-20080610/dom.html#getelementsbyclassname>
> <http://www.w3.org/TR/selectors-api2/>

Again you have referred to a Working Draft and a Working Group Note, which 
both are non-normative, although a Proposed Recommendation and a 
Recommendation, respectively, are available.

<http://www.w3.org/TR/2014/PR-html5-20140916/infrastructure.html#common-dom-interfaces>

refers to

<http://www.w3.org/TR/dom/#document>

and thus

<http://www.w3.org/TR/dom/#dom-document-getelementsbyclassname>

and

<http://www.w3.org/TR/dom/#dom-parentnode-queryselectorall>

-- 
PointedEars
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