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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Inserting a DIV inside another DIV
Date: Sun, 27 Aug 2017 16:27:29 +0200
Organization: PointedEars Software (PES)
Lines: 33
Message-ID: <2016472.iZASKD2KPV@PointedEars.de>
References: <f8562d64-82c7-4f5b-832f-4a8e4e7e7f00@googlegroups.com> <XnsA7DA7B81F3EA5eejj99@194.109.6.166> <e8340f56-ccf7-48ef-9662-e5ab7a498476@googlegroups.com> <XnsA7DB5B3E25BD7eejj99@194.109.6.166> <6711ac96-c627-4e0c-b267-6a7602e0cdc5@googlegroups.com> <f0e3hoFs79eU1@mid.individual.net> <5095798.DvuYhMxLoT@PointedEars.de> <f0flsfF8a6fU1@mid.individual.net> <7368313.T7Z3S40VBb@PointedEars.de>
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Thomas 'PointedEars' Lahn wrote:

> That is why
> 
>   el.insertBefore(child, el.lastChild);
> 
> is equivalent to
> 
>   el.appendChild(child);

*Only* …
 
> [If the element node has no child nodes,

… I should say, because then

> el.lastChild is `null`, and el.insertBefore() is specified and implemented 
> to handle that, so this is safe in all cases.]

IOW,

  el.insertBefore(child, null);
 
is equivalent to

  el.appendChild(child);

> <https://www.w3.org/TR/2015/REC-dom-20151119/#dom-node-insertbefore>

-- 
PointedEars
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