How to use pure CSS to achieve text fade-in animation effect (source code attached)

The content of this article is about how to use pure CSS to achieve the fade-in animation effect of text (source code attached). It has certain reference value. Friends in need can refer to it. I hope it will be useful to you. helped.

Effect preview

Source code download

https://github.com/comehope/front- end-daily-challenges

Code Interpretation

Define dom, the container contains several sub-elements, each sub-element is 1 letter:

<div>
    <span>h</span>
    <span>a</span>
    <span>p</span>
    <span>p</span>
    <span>y</span>
    <span> </span>
    <span>h</span>
    <span>o</span>
    <span>l</span>
    <span>i</span>
    <span>d</span>
    <span>a</span>
    <span>y</span>
    <span>s</span>
</div>

Centered display:

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(pink, white, pink);
}

Set the font style:

.container span {
    display: inline-block;
    color: purple;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 40px;
}

Define the movement effect of text from left to right:

.container span {
    animation: sideSlide 4s forwards infinite;
    transform: translateX(-100vw);
}

@keyframes sideSlide {
    15%, 20% {
        transform: translateX(0.5em);
    }

    24% {
        transform: translateX(0);
    }

    25%, 75% {
        transform: translateX(0);
    }

    90%, 100% {
        transform: translateX(100vw);
    }
}

Increase the animation effect of text scaling:

.container span {
    transform: translateX(-100vw) scale(0);
}

@keyframes sideSlide {
    15%, 20% {
        transform: translateX(0.5em) scale(1);
    }

    24% {
        transform: translateX(0) scale(1.2);
    }

    25%, 75% {
        transform: translateX(0) scale(1);
    }

    90%, 100% {
        transform: translateX(100vw) scale(0);
    }
}

Add text entry And the fade-in and fade-out effect when appearing:

.container span {
    filter: opacity(0);
}

@keyframes sideSlide {
    15%, 20% {
        transform: translateX(0.5em) scale(1);
    }

    24% {
        transform: translateX(0) scale(1.2);
    }

    25%, 75% {
        transform: translateX(0) scale(1);
        filter: opacity(1);
    }

    90%, 100% {
        transform: translateX(100vw) scale(0);
        filter: opacity(0);
    }
}

Increase the effect of text color change:

@keyframes sideSlide {
    15%, 20% {
        transform: translateX(0.5em) scale(1);
        color: purple;
    }

    24% {
        transform: translateX(0) scale(1.2);
        color: cyan;
    }

    25%, 75% {
        transform: translateX(0) scale(1);
        filter: opacity(1);
        color: purple;
    }

    90%, 100% {
        transform: translateX(100vw) scale(0);
        filter: opacity(0);
    }
}

Set the subscript variable of the sub-element:

.container span:nth-child(1) { --n: 1; }
.container span:nth-child(2) { --n: 2; }
.container span:nth-child(3) { --n: 3; }
.container span:nth-child(4) { --n: 4; }
.container span:nth-child(5) { --n: 5; }
.container span:nth-child(6) { --n: 6; }
.container span:nth-child(7) { --n: 7; }
.container span:nth-child(8) { --n: 8; }
.container span:nth-child(9) { --n: 9; }
.container span:nth-child(10) { --n: 10; }
.container span:nth-child(11) { --n: 11; }
.container span:nth-child(12) { --n: 12; }
.container span:nth-child(13) { --n: 13; }
.container span:nth-child(14) { --n: 14; }

Set the animation delay of the sub-element :

.container span {
    animation-delay: calc((var(--n) - 1) * 0.05s);
}

Done!

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