CSS Animation and Display: None
In CSS, animating elements that are hidden (e.g., display: none) is not straightforward. While setting display: none removes an element from the document flow, it still occupies space. To resolve this issue:
1. Set a Fixed Height:
Since you cannot animate between display: none and display: block, fix the initial height of the hidden element to the height it will occupy when revealed.
CSS:
#main-div {
height: 0;
display: block;
overflow: hidden;
animation-delay: 3.5s;
}
2. Use an Animation Keyframe:
Define an animation keyframe that transitions the element from a height of 0 to the desired height.
CSS:
@keyframes main-div-slide {
from {
height: 0;
}
to {
height: 375px;
}
}
3. Apply the Animation:
Associate the animation keyframe with the hidden element.
CSS:
#main-div {
animation: main-div-slide 1s ease 3.5s forwards;
}
Now, the hidden element will seamlessly slide down into view without affecting the layout of other elements on the page.
Note: This approach works if you have a fixed height for the hidden element. For dynamic heights, you may need to use jQuery or JavaScript.
The above is the detailed content of How to Animate a Hidden Element in CSS?. For more information, please follow other related articles on the PHP Chinese website!
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