layout/style/test/test_reframe_input.html
author Cristian Tuns <ctuns@mozilla.com>
Fri, 24 Sep 2021 14:42:22 -0400
changeset 593147 0b4005ebc9776ff43d99d1427c1a1fd2e14d9a44
parent 546977 0e94014166b3ebb90615a54feee45edf3b1f0115
permissions -rw-r--r--
Backed out changeset dd075a074e45 (bug 1730518) for causing content crashes (bug 1732479). CLOSED TREE

<!doctype html>
<meta charset="utf-8">
<title>Test for bug 1658302: We don't reframe for placeholder attribute value changes.</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<input id="input">
<textarea id="textarea"></textarea>
<script>
SimpleTest.waitForExplicitFinish();
const utils = SpecialPowers.DOMWindowUtils;

function expectReframe(shouldHaveReframed, callback) {
  document.documentElement.offsetTop;
  const previousConstructCount = utils.framesConstructed;
  const previousReflowCount = utils.framesReflowed;

  callback();

  document.documentElement.offsetTop;
  isnot(previousReflowCount, utils.framesReflowed, "We should have reflowed");
  (shouldHaveReframed ? isnot : is)(previousConstructCount,
                                    utils.framesConstructed,
    `We should ${shouldHaveReframed ? "" : "not"} have reframed`);
}

for (const control of document.querySelectorAll("input, textarea")) {
  // Creating the placeholder attribute reframes right now.
  //
  // TODO: Could be avoided with some more work.
  expectReframe(true, () => {
    control.placeholder = "foo";
  });

  // Incrementally changing it should not reframe, just reflow.
  expectReframe(false, () => {
    control.placeholder = "bar";
  });

  // Removing the placeholder attribute reframes right now.
  //
  // TODO: Could maybe be avoided with some more work.
  expectReframe(true, () => {
    control.removeAttribute("placeholder");
  });
}

SimpleTest.finish();
</script>