​x
 
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<!DOCTYPE html>
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<title>Example</title>
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<style>
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input {
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    caret-color: orange;
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    color: white;
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    background: black;
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    font-size: 7vw;
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    padding: 3vw;
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    animation: myAnimation 10s infinite;
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}
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@keyframes myAnimation {
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  50% {
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    caret-color: limegreen;
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  }
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}
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</style>
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​
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<input autofocus placeholder="Name">