JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="test" value="Im a placeholder!"/>

JavaScript

var placeholder = $("#test").val();

$("#test").keydown(function() {
    if (this.value == placeholder) {
        this.value = '';
    }
}).blur(function() {
    if (this.value == '') {
        this.value = placeholder;
    }
});