The problem with opacity is that it will also affect the content, when often you do not want this to happen. If you just want your element ... ... <看更多>

CSS Transitions with transparency, rgba, hsla */. /* color transitions occur in rgba color-space. this means transitioning hsla lightness or hue doesn't ... ... <看更多>

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The opacity property controls transparency and opacity of an element. ... Animatable: Yes; CSS Object Model Property: opacity; Percentages: N/A ... ... <看更多>