JSFiddle - React, Tailwind, and code Playground

HTML

<input value="digite aqui" type="text" id="el" />

JavaScript

var input = document.querySelector('input');
var accoes = {
    onblur: "if(this.value == '') {this.value = 'digite aqui';}",
    onfocus: "if(this.value == 'digite aqui') {this.value = '';}"
}
for (var prop in accoes) {
    input.setAttribute(prop, accoes[prop]);
}