test_navigate_event_strong_sourceElement.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <title>Navigation source element should be kept alive until navigate event is fired</title>

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

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

</head>

<body>

<form><input type=submit></form>

<script>

"use strict";

const form = document.querySelector("form");

add_task(async () => {

  const {promise, resolve} = Promise.withResolvers();

  navigation.addEventListener("navigate", e => {

    resolve(e.sourceElement);

    e.intercept();

  }, {once: true});

  document.querySelector("input").click();

  document.querySelector("input").remove();

  SpecialPowers.forceGC();

  SpecialPowers.forceCC();

  const sourceElement = await promise;

  is(sourceElement.tagName, "INPUT",

    "Source element should be kept alive until navigate event is fired.");

});

</script>

</body>

</html>