JSFiddle - React, Tailwind, and code Playground

by Comandeer

HTML

<input value="Domyślna wartość">
<button>Zmień domyślną wartość</button>

JavaScript

const input = document.querySelector( 'input' );
const observer = new MutationObserver( function( mutations ) {
	mutations.forEach( ( mutation ) => {
		console.log( mutation );
	} );
} );

observer.observe( input, {
	attributes: true
} );

document.querySelector( 'button' ).addEventListener( 'click', () => {
	input.defaultValue = Date.now();
} );