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

</script>