Why Doesn't My CSS3 Transition Work When Using the Display Property?

CSS3 Transition Not Working with Display Property

Overview

This article addresses the issue of CSS transitions not functioning correctly when using the display property. It provides insights and alternative solutions to achieve the desired效果.

Problem Statement

The goal is to create an effect where a hidden div smoothly fades in upon hovering over its parent element. However, attempts to implement this using CSS transitions have been unsuccessful, resulting only in the hidden div appearing without any transitions.

Root Cause

CSS transitions cannot be applied to elements with the display property set to none. This is because display: none removes the element entirely from the document flow, making it unavailable for any effects.

Alternative Solution

To achieve the desired fading effect, we can utilize the opacity property instead of display. By manipulating the opacity of the hidden div, we can gradually reveal it when hovered over.

Here is the updated CSS code:

#header #button:hover > .content {
    opacity: 1;
    height: 150px;
    padding: 8px;    
}

#header #button .content {
    opacity:0;
    height: 0;
    padding: 0 8px;
    overflow: hidden;

    -webkit-transition: all .3s ease .15s;
    -moz-transition: all .3s ease .15s;
    -o-transition: all .3s ease .15s;
    -ms-transition: all .3s ease .15s;
    transition: all .3s ease .15s;
}

In this code, the opacity of the hidden div is set to 0 initially, making it invisible. When the parent button is hovered over, the opacity gradually transitions to 1, revealing the div with a smooth fading effect.

Conclusion

By understanding the limitations of the display property and implementing an alternative solution using opacity, one can achieve the desired fade-in transition效果 for hidden elements upon hover.

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