css/css-overflow/scrollable-overflow-transform-dynamic-004.html

﻿<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Overflow: Scrollable Overflow Transform Dynamic Position Change</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollable" />
<meta name="assert" content="Checks that changes on an element's transform contribute to the scrollable overflow, even when some element has changed position too.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .container {
    position: absolute;
    width: 100px;
    height: 100px;
    overflow: auto;
    background: silver;
    border: solid thick;
  }

  .element {
    width: 50px;
    height: 50px;
    background: lime;
  }
</style>

<div id="container1" style="top: 100px;" class="container">
  <div id="element1" style="transform: translateX(20px);" class="element"></div>
</div>

<div id="container2" style="top: 250px;" class="container">
  <div id="element2" style="transform: translateY(30px);" class="element"></div>
</div>

<div id="container3" style="top: 400px;" class="container">
  <div id="element3" style="transform: translate(20px, 30px);" class="element"></div>
</div>

<script>
  test(() => {
    assert_equals(container1.scrollWidth, 100);
    container1.style.top = "110px";
    element1.style.transform = "translateX(200px)";
    assert_equals(container1.scrollWidth, 250);
  }, "Check scrollWidth before and after position and transform chage");

  test(() => {
    assert_equals(container2.scrollHeight, 100);
    container2.style.top = "260px";
    element2.style.transform = "translateY(300px)";
    assert_equals(container2.scrollHeight, 350);
  }, "Check scrollHeight before and after position and transform chage");

  test(() => {
    assert_equals(container3.scrollWidth, 100);
    assert_equals(container3.scrollHeight, 100);
    container3.style.top = "410px";
    element3.style.transform = "translate(200px, 300px)";
    assert_equals(container3.scrollWidth, 250);
    assert_equals(container3.scrollHeight, 350);
  }, "Check scrollWidth and scrollHeight after position and transform chage");
</script>