Path: csiph.com!3.eu.feeder.erje.net!feeder.erje.net!news.mb-net.net!open-news-network.org!.POSTED.178.197.192.93!not-for-mail
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: element transition
Supersedes: <2775651.e9J7NaK4W3@PointedEars.de>
Date: Fri, 09 Apr 2021 16:58:58 +0200
Organization: PointedEars Software (PES)
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Message-ID: <3109453.aeNJFYEL58@PointedEars.de>
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Thomas 'PointedEars' Lahn wrote:

> Andrew Poulos wrote:
>> So a setting for the display property affects the transition property?
> 
> Yes.  The problem is that “display: none” means that the element should
> not be rendered at all.  If you use “visibility: hidden” instead, and
> switch that to “visibility: visible” without delay when you are fading in,
> then the transition will work.  For fading out you have to use the same
> delay for the “visibility” as for “opacity”, though; otherwise the element
> will disappear immediately and the transition of “opacity” cannot take
> effect.

N.B.: Declaring the “visibility” property value (CSS ≤ 2.x) as well was/is a 
workaround for layout engines that did/do not support the “opacity” property 
(CSS 3).  For modern layout engines which support CSS Level 3 and above, 
declaring “visibility” is not strictly necessary if you declare “opacity” 
like that, although there might still be circumstances where it is useful.

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