CodePen Embed - JjoEMde

<button data-item="One">One</button>
<button data-item="Two">Two</button>
<h1>Default text</h1>

const title = document.querySelector('h1')
document.querySelectorAll('button').forEach(item => {
  item.addEventListener('click', function(e) {
    title.textContent = this.dataset.item
  })
})

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