<input placeholder="表示させたいテキスト">
* {
	box-sizing: border-box;
}
body {
	min-height: 100vh;
	margin: 0;
	padding: 0;
	display: flex;
	justify-content: center;
	align-items: center;
}

input {
	padding: 10px;
}
input:focus::-webkit-input-placeholder {
	color: transparent;
}
input:focus::-moz-placeholder {
	color: transparent;
}
input:focus::-ms-input-placeholder {
	color: transparent;
}
input:focus::placeholder {
	color: transparent;
}

External CSS

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External JavaScript

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