just copy this script and paste it into a text editor and download it as an html
<button onclick="openAboutBlank()">Launch Site</button>
<script>
function openAboutBlank() {
// 1. Open a new window at about:blank
var win = window.open('about:blank');
// 2. Set the site you want to open
var url = "https://eaglercraftz.pages.dev/wasm/builds/0.1.0//";
// 3. Create an iframe and style it to fill the entire page
var iframe = win.document.createElement('iframe');
iframe.style.width = "100%";
iframe.style.height = "100%";
iframe.style.border = "none";
iframe.style.position = "fixed";
iframe.style.top = "0";
iframe.style.left = "0";
iframe.src = url;
// 4. Inject the iframe into the blank tab
win.document.body.appendChild(iframe);
}
</script>