CSS transition with visibility not working

Question

In the fiddle below  I ve a transition on visibility and opacity separately  The latter works but the former doesn t  Moreover  in case of visibility  the transition time is interpreted as delay on hover out  Happens in both Chrome  amp  Firefox  Is this a bug   http   jsfiddle net 0r218mdo 3   Case 1    inner      visibility hidden      transition visibility 1000ms     outer hover  inner      visibility visible      Case 2    inner1      opacity 0      transition opacity 1000ms     outer1 hover  inner1      opacity 1

User · Accepted Answer

This is not a bug- you can only transition on ordinal calculable properties  an easy way of thinking of this is any property with a numeric start and end number value  though there are a few exceptions    This is because transitions work by calculating keyframes between two values  and producing an animation by extrapolating intermediate amounts   visibility in this case is a binary setting  visible hidden   so once the transition duration elapses  the property simply switches state  you see this as a delay- but it can actually be seen as the final keyframe of the transition animation  with the intermediary keyframes not having been calculated  what constitutes the values between hidden visible  Opacity  Dimension  As it is not explicit  they are not calculated    opacity is a value setting  0-1   so keyframes can be calculated across the duration provided   A list of transitionable  animatable  properties can be found here

User · Answer

Visibility is an animatable property according to the spec  but transitions on visibility do not work gradually  as one might expect  Instead transitions on visibility delay hiding an element  On the other hand making an element visible works immediately  This is as it is defined by the spec  in the case of the default timing function  and as it is implemented in the browsers    This also is a useful behavior  since in fact one can imagine various visual effects to hide an element  Fading out an element is just one kind of visual effect that is specified using opacity  Other visual effects might move away the element using e g  the transform property  also see http   taccgl org blog css-transition-visibility html  It is often useful to combine the opacity transition with a visibility transition  Although opacity appears to do the right thing  fully transparent elements  with opacity 0  still receive mouse events  So e g  links on an element that was faded out with an opacity transition alone  still respond to clicks   although not visible  and links behind the faded element do not work  although being visible through the faded element   See http   taccgl org blog css-transition-opacity-for-fade-effects html   This strange behavior can be avoided by just using both transitions  the transition on visibility and the transition on opacity  Thereby the visibility property is used to disable mouse events for the element while opacity is used for the visual effect  However care must be taken not to hide the element while the visual effect is playing  which would otherwise not be visible  Here the special semantics of the visibility transition becomes handy  When hiding an element the element stays visible while playing the visual effect and is hidden afterwards  On the other hand when revealing an element  the visibility transition makes the element visible immediately  i e  before playing the visual effect

User · Answer

Visibility is animatable  Check this blog post about it  http   www greywyvern com  post 337  You can see it here too  https   developer mozilla org en-US docs Web CSS CSS animated properties  Let s say you have a menu that you want to fade-in and fade-out on mouse hover  If you use opacity 0 only  your transparent menu will still be there and it will animate when you hover the invisible area  But if you add visibility hidden  you can eliminate this problem    x000D   x000D  div   x000D      width 100px  x000D      height 20px  x000D    x000D   menu   x000D      visibility hidden  x000D      opacity 0  x000D      transition visibility 0 3s linear opacity 0 3s linear  x000D       x000D      background  eee  x000D      width 100px  x000D      margin 0  x000D      padding 5px  x000D      list-style none  x000D    x000D  div hover  gt   menu   x000D      visibility visible  x000D      opacity 1  x000D    x000D   lt div gt  x000D     lt a href     gt Open Menu lt  a gt  x000D     lt ul class  menu  gt  x000D       lt li gt  lt a href     gt Item lt  a gt  lt  li gt  x000D       lt li gt  lt a href     gt Item lt  a gt  lt  li gt  x000D       lt li gt  lt a href     gt Item lt  a gt  lt  li gt  x000D     lt  ul gt  x000D   lt  div gt  x000D   x000D   x000D

[css] CSS transition with visibility not working

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