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Groups > comp.lang.javascript > #33865

Re: CSS transition

From Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups comp.lang.javascript
Subject Re: CSS transition
Date 2017-08-23 14:51 +0200
Organization PointedEars Software (PES)
Message-ID <1745316.usQuhbGJ8B@PointedEars.de> (permalink)
References <fe80a18f-f772-4375-96d5-8acc749b7b86@googlegroups.com> <onjm41$163j$1@gioia.aioe.org>

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JR wrote:
^^
Your real name belongs there.

> However, you won't get a smooth animation by changing the 'left' (or
> top, right, bottom) property, because it will trigger a reflow process
> in the browser [1].

There is no reason why it should, and in fact the referred blog entry does 
not claim this.  “Reflow” pertains to the rearrangement of elements in the 
document flow.  With `position: absolute`, an element is *taken out* of the 
document flow.  What will happen is “repaint”, but that will happen in any 
case.

> […]
> Another possibility is using the fresh Web Animations API [2], i.e
> Element.animate(), supported by some modern browsers so far.

Interesting.

> […]
> [1]
> <https://www.paulirish.com/2012/why-moving-elements-with-translate-is-better-than-posabs-topleft/>

This is from 2012-12-20.  The update referred there is from 2016.  We have 
2017-08 now.

Be suspicious of any Web development advice that is older than one year.  
While the advice does not change, layout engines keep being improved.  With 
“rapid release” schedules, the advice from last month can already be out of 
date.  (That is also why it is a bad idea to rely on books in this field.)

> [2] <https://developer.mozilla.org/en-US/docs/Web/API/Web_Animations_API>

-- 
PointedEars
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Thread

CSS transition bit-naughty@hotmail.com - 2017-08-22 10:59 -0700
  Re: CSS transition Martin Honnen <martin.honnen@gmx.de> - 2017-08-22 21:16 +0200
    Re: CSS transition Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-23 03:14 +0200
      Re: CSS transition Martin Honnen <martin.honnen@gmx.de> - 2017-08-23 12:24 +0200
  Re: CSS transition JR <jrfaqcom@gmail.com> - 2017-08-23 07:41 -0300
    Re: CSS transition Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-23 14:51 +0200
    Re: CSS transition bit-naughty@hotmail.com - 2017-08-23 23:14 -0700
      Re: CSS transition Joao Rodrigues <groups_jr-1@yahoo.com.br> - 2017-08-25 20:17 -0300

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