test_anchor_download_single_navigate_event.html

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<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <title>&lt;a download&gt; fires exactly one navigate event</title>

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

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

</head>

<body>

<script>

"use strict";

const SJS = "file_anchor_download_single_navigate_event.sjs";

async function waitForDownloadRequest() {

  const response = await fetch(`${SJS}?arrived`);

  await response.text();

add_task(async function test_anchor_download_single_navigate_event() {

  await SpecialPowers.pushPrefEnv({

    set: [

      ["dom.navigation.webidl.enabled", true],

      ["dom.navigation.api.strict.enabled", true],

],

});

  const iframe = document.createElement("iframe");

  iframe.src = "blank.html";

  document.body.appendChild(iframe);

  await new Promise(resolve => iframe.addEventListener("load", resolve, { once: true }));

  let navigateEvents = 0;

  iframe.contentWindow.navigation.onnavigate = _ => navigateEvents++;

  const a = iframe.contentDocument.createElement("a");

  a.href = `${SJS}?download`;

  a.download = "";

  iframe.contentDocument.body.appendChild(a);

  a.click();

  // The download request reaching the server means the load has gone past

  // the point where a second navigate event could be fired for it.

  await waitForDownloadRequest();

  is(navigateEvents, 1,

    "Only the download request navigate event should fire");

  iframe.remove();

  await fetch(`${SJS}?release`);

});

</script>

</body>

</html>