display none

"Display none" is a CSS property that can be applied to an HTML element to hide it from view. When an element is set to "display: none," it will not be visible on the page and will take up no space in the layout. This is often used to hide elements that are not needed at certain times, such as pop-up windows or form fields that are only needed after a specific action is taken.

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css display none 动画

要实现CSS的display:none动画效果，可以使用CSS过渡和一些技巧。一种方法是使用transition属性和opacity属性来实现淡入淡出的效果。首先，通过给元素设置一个初始的透明度为0，并使用display:none隐藏元素。然后，通过将display属性设置为block或其他合适的值，逐渐增加透明度来显示元素。可以使用transition属性来实现透明度的渐变效果。最后，在透明度达到1时，将display属性设置回none来隐藏元素。这样就可以实现CSS的display:none动画效果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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displaynone和visibilityhidden

display:none 和 visibility:hidden 是 CSS 中用来隐藏元素的两个属性。

- display:none 意味着该元素完全不会被渲染，并且在文档布局中不占据空间。
- visibility:hidden 意味着该元素仍然会被渲染，但是不可见，并且在文档布局中仍占据空间。