test_anonymousContent_append_after_reflow.html

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<!DOCTYPE HTML>

<html>

<!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1020244 -->

<meta charset="utf-8">

<title>Test for Bug 1020244 - Make sure anonymous content still works after a reflow (after the canvasframe has been reconstructed)</title>

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

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

<div>

  <div id="test-element" style="color:red;">text content</div>

</div>

<script>

  info("Inserting anonymous content into the document frame");

  let chromeDocument = SpecialPowers.wrap(document);

  let anonymousContent = chromeDocument.insertAnonymousContent();

  let testElement = document.querySelector("div");

  anonymousContent.root.appendChild(testElement.cloneNode(true));

  info("Modifying the style of an element in the anonymous content");

  anonymousContent.root.getElementById("test-element").style.color = "green";

  info("Toggling the display style on the document element to force reframing");

  // Note that we force sync reflows to make sure the canvasframe is recreated

  // synchronously.

  document.documentElement.style.display = "none";

  let forceFlush = document.documentElement.offsetHeight;

  document.documentElement.style.display = "block";

  forceFlush = document.documentElement.offsetHeight;

  info("Checking that the anonymous content can be retrieved still");

  let color = anonymousContent.root.getElementById("test-element").style.color;

  is(color, "green", "The anonymous content still exists after reflow");

  info("Removing the anonymous content");

  chromeDocument.removeAnonymousContent(anonymousContent);

</script>