JSFiddle - React, Tailwind, and code Playground

HTML

<input id="name_input" name="name" type="text" class="input" placeholder="Введите Ваше имя:" value=""/>

CSS

#name_input {
    height: 18px;
    width: 200px;
}

JavaScript

var name_input = document.querySelector('#name_input'),
    placeholder = name_input.getAttribute('placeholder');

name_input.onblur = function() {
    if (this.value === "") {
        this.setAttribute('placeholder', placeholder);
    }
}

name_input.onfocus = function() {
    this.setAttribute('placeholder', '');
}