test_bug1330375.html

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<!DOCTYPE html>

<!-- https://bugzil.la/1330375 -->

<meta charset="utf-8">

<title>Test for Bug 1330375</title>

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

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

<body>

    <div id="content">

        <table>

            <tbody>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

                <tr><td>lorem ipsum</td><td>dolor sit</td><td>amet</td><td>consectetur adipsicing</td><td>elit.</td></tr>

            </tbody>

        </table>

    </div>

</body>

<script>

"use strict";

const gUtils = SpecialPowers.getDOMWindowUtils(window);

function flush_layout(element) {

  (element || document.documentElement).offsetHeight;

SimpleTest.waitForExplicitFinish();

window.onload = function() {

  flush_layout(document.getElementById("content"));

  let before = {

      framesConstructed: gUtils.framesConstructed,

      framesReflowed: gUtils.framesReflowed,

};

  // Begin test

  let rows = document.getElementsByTagName("tr");

  for (var r = 0; r < rows.length; r++) {

    let row = rows[r];

    row.innerText;

    // Cause potential invalidation of layout:

    row.style.display = "none";

  is(gUtils.framesConstructed, before.framesConstructed, "Frames constructed should be 0");

  is(gUtils.framesReflowed, before.framesReflowed, "Frames reflowed should be 0");

  SimpleTest.finish();

</script>