Quelle test_flushing_frame.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/layout/style/test/test_flushing_frame.html

<!doctype html>
<meta charset="utf-8">
<title>
  Test for bug 1545516: We don't flush layout unnecessarily on the parent
  document when the frame is already disconnected.
</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<div id="content"></div>
<script>
  SimpleTest.waitForExplicitFinish();
  const iframe = document.createElement("iframe");
  const content = document.querySelector("#content");
  const parentUtils = SpecialPowers.getDOMWindowUtils(window);
  iframe.onload = function() {
    const win = iframe.contentWindow;
    iframe.offsetTop; // flush layout
    content.style.display = "inline"; // Dirty style with something that will reframe.

    const previousConstructCount = parentUtils.framesConstructed;
    let pagehideRan = false;
    win.addEventListener("pagehide", function() {
      pagehideRan = true;
      win.foo = win.innerWidth;
      is(parentUtils.framesConstructed, previousConstructCount, "innerWidth shouldn't have flushed parent document layout")
      win.bar = win.document.documentElement.offsetHeight;
      is(parentUtils.framesConstructed, previousConstructCount, "offsetHeight shouldn't have flushed parent document layout")
      win.baz = win.getComputedStyle(win.document.documentElement).color;
      is(parentUtils.framesConstructed, previousConstructCount, "getComputedStyle shouldn't have flushed parent document layout")
    });

    iframe.remove(); // Remove the iframe
    is(pagehideRan, true, "pagehide handler should've ran");
    is(parentUtils.framesConstructed, previousConstructCount, "Nothing should've flushed the parent document layout yet");
    content.offsetTop;
    isnot(parentUtils.framesConstructed, previousConstructCount, "We should've flushed layout now");
    SimpleTest.finish();
  };
  document.body.appendChild(iframe);
</script>

Messung V0.5

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