<!DOCTYPE html>
<head>
<script src="../resources/js-test.js"></script>
</head>
<body>

<p id="description"></p>

<div id="container" style="width: 100px; overflow: scroll">
  <div style="border: 1px solid #000; width: 1000px; height: 5000px;">5000-pixel box</div>
  <button id="target1">Target</button>
  <button id="target2">Target</button>
  <button id="target3">Target</button>
  <div style="border: 1px solid #000; width: 1000px; height: 5000px;">5000-pixel box</div>
</div>

<div id="console"></div>

<script>
description("Tests that scrolling to make an element visible works when the inner scroll container doesn't need to be scrolled, but the other one does.");

function runTest() {
    window.container = document.getElementById("container");
    window.target1 = document.getElementById("target1");
    window.target2 = document.getElementById("target2");
    window.target3 = document.getElementById("target3");

    var target1AccessibleObject;
    var target2AccessibleObject;
    var target3AccessibleObject;
    if (window.accessibilityController) {
        target1.focus();
        target1AccessibleObject = accessibilityController.focusedElement;
        target2.focus();
        target2AccessibleObject = accessibilityController.focusedElement;
        target3.focus();
        target3AccessibleObject = accessibilityController.focusedElement;
    }

    // Reset the initial scroll positions (since calling focus() can scroll the page too).
    window.scrollTo(0, 0);
    container.scrollTop = 0;
    shouldBeZero("window.pageYOffset");
    shouldBeZero("container.scrollTop");
    shouldBeGreaterThanOrEqual("target1.getBoundingClientRect().top", "5000");

    // Scroll to make the middle target visible.
    if (window.accessibilityController)
        target2AccessibleObject.scrollToMakeVisible();

    // Instead of testing the exact scroll offsets of the two containers, just test that
    // the new absolute position of the target is on-screen.
    shouldBeGreaterThanOrEqual("window.innerHeight", "target2.getBoundingClientRect().bottom");

    // Make sure that calling scrollToMakeVisible on target1 and target3 don't result in any
    // scrolling, because they should already be within the viewport.
    window.target2top = target2.getBoundingClientRect().top;
    if (window.accessibilityController)
        target1AccessibleObject.scrollToMakeVisible();
    shouldBe("target2top", "target2.getBoundingClientRect().top");
    if (window.accessibilityController)
        target3AccessibleObject.scrollToMakeVisible();
    shouldBe("target2top", "target2.getBoundingClientRect().top");

    finishJSTest();
}

runTest();

</script>

</body>
</html>