test_accept_header.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Accept header</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<script>

SimpleTest.requestCompleteLog();

// All the requests are sent to test_accept_header.sjs which will return

// different content based on the queryString. When the queryString is 'get',

// test_accept_header.sjs returns a JSON object with the latest request and its

// accept header value.

function test_last_request_and_continue(query, expected) {

  fetch("test_accept_header.sjs?get").then(r => r.json()).then(json => {

    is(json.type, query, "Expected: " + query);

    is(json.accept, expected, "Accept header: " + expected);

    next();

});

function test_iframe() {

  let ifr = document.createElement("iframe");

  ifr.src = "test_accept_header.sjs?iframe";

  ifr.onload = () => {

    test_last_request_and_continue("iframe", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");

};

  document.body.appendChild(ifr);

function test_image() {

  let i = new Image();

  i.src = "test_accept_header.sjs?image";

  i.onload = function() {

    // Fetch spec says we should have: "image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5"

    test_last_request_and_continue("image", "image/avif,image/webp,image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5");

function test_style() {

  let head = document.getElementsByTagName("head")[0];

  let link = document.createElement("link");

  link.rel = "stylesheet";

  link.type = "text/css";

  link.href = "test_accept_header.sjs?style";

  link.onload = () => {

    test_last_request_and_continue("style", "text/css,*/*;q=0.1");

};

  head.appendChild(link);

function test_worker() {

  let w = new Worker("test_accept_header.sjs?worker");

  w.onmessage = function() {

    test_last_request_and_continue("worker", "*/*");

let tests = [

  test_iframe,

  test_image,

  test_style,

  test_worker,

];

function next() {

  if (!tests.length) {

    SimpleTest.finish();

    return;

  let test = tests.shift();

  test();

SimpleTest.waitForExplicitFinish();

SpecialPowers.pushPrefEnv({ "set": [

  [ "dom.enable_performance_observer", true ]

]}, next);

</script>

</body>

</html>