elinks/test/ecmascript/assert/fetch.html

<script>
async function getData() {
  const url = "hello.html";
  try {
    const response = await fetch(url);

    if (!response.ok) {
      console.error(`Response status: ${response.status}`);
    }
    const txt = await response.text();
    return txt;
  } catch (error) {
    console.error(error.message);
  }
}
console.error("fetch.html");
var ex = 0;

getData().then(text => {
  console.assert(text === 'Hello', 'hello');
  ex = 1;
});

function loop()
{
   if (ex == 1) {
      setTimeout(console.exit());
   } else {
      setTimeout(loop, 1);
   }
}
loop();
</script>