Use onClick with window.location.reload(), i.e. :

<button onClick="window.location.reload();">Refresh Page</button>

Or history.go(0), i.e.:

<button onClick="history.go(0);">Refresh Page</button>

Or window.location.href=window.location.href for 'full' reload, i.e.:

<button onClick="window.location.href=window.location.href">Refresh Page</button>

The Button element - developer.mozilla.org

This works for me:

function refreshPage(){
    window.location.reload();
} 

<button type="submit" onClick="refreshPage()">Refresh Button</button>

I noticed that all the answers here use inline onClick handlers. It's generally recommended to keep HTML and Javascript separate.

Here's an answer that adds a click event listener directly to the button. When it's clicked, it calls location.reload which causes the page to reload with the current URL.

const refreshButton = document.querySelector('.refresh-button');

const refreshPage = () => {
  location.reload();
}

refreshButton.addEventListener('click', refreshPage)

.demo-image {
  display: block;
}

<button class="refresh-button">Refresh!</button>
<img class="demo-image" src="https://picsum.photos/200/300">