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<!doctype html>
<html>
<head>
<title>Viewport: Offset</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="viewport_support.js"></script>
<script>
setup({explicit_done: true, explicit_timeout: true});
</script>
<style>
html {
width: 100%;
height: 100%;
}
#fullscreenBox {
position: fixed;
left: 0;
top: 0;
width: 100%;
height: 100%;
visibility: hidden;
}
</style>
</head>
<body>
<h1>Viewport: Offset</h1>
<h4>
Test Description: Tests the offset scrolling properties on an
unscrollable page.
</h4>
<h2 style="color: red">THIS IS A MANUAL TEST</h2>
<p id="skip">
<button id="skipbtn" onclick="skipManualTest();">Skip Test</button>
</p>
<h4>Instruction</h4>
<p id="instruction"></p>
<button id="continue">Start Test</button>
<div id="log"></div>
<div id="fullscreenBox">
<!-- Invisible but needed to get maximum scrollable extents in the
presence of a collapsible URL bar. -->
</div>
</body>
<script>
var continueBtn = document.getElementById("continue");
function continueTest() {
nextStep(function(instructionText) {
var instruction = document.getElementById("instruction");
continueBtn.innerText = "Continue";
instruction.innerText = instructionText;
});
}
continueBtn.addEventListener('click', continueTest);
// Prevent scrolling (though there should be no overflow) so that all
// scrolling must happen as panning the visual viewport within the
// layout viewport.
document.documentElement.style.overflow = "hidden";
addManualTestStep(
function() {},
null,
'1. Ensure the browser is at the default pinch and browser zoom ' +
'levels (100%). Most browsers: ctrl+0');
var scale = 3.0;
var xTarget = 2 * window.innerWidth / scale;
var yTarget = 2 * window.innerHeight / scale;
addManualTestStep(
showPinchWidget.bind(null, scale, xTarget, yTarget, continueTest),
null,
'2.Follow instructions on pinch zoom dialog.');
addManualTestStep(
function() {
var actualScale = window.visualViewport.scale;
var actualOffsetLeft = window.visualViewport.offsetLeft;
var actualOffsetTop = window.visualViewport.offsetTop;
// This needs to happen before assertions in case they fail. A
// failed assertion stops running this function.
window.scrollTo(0, 0);
// Ensure we zoomed in to about what we expect.
assert_approx_equals(actualScale, scale, 0.2,
"window.visualViewport.scale reflects pinch-zoom level");
assert_approx_equals(actualOffsetLeft, xTarget, 5,
"offsetLeft value is correct.");
assert_approx_equals(actualOffsetTop, yTarget, 5,
"offsetTop value is correct.");
},
'With ~300% pinch-zoom',
'3. Pinch-zoom back out to the minimum scale');
addManualTestStep(
showPinchWidget.bind(null, 2, 0, 0, continueTest),
null,
'4.Follow instructions on pinch zoom dialog.');
addManualTestStep(
function() {
document.documentElement.style.overflow = "";
continueBtn.style.position = "absolute";
continueBtn.style.left = "150%";
continueBtn.style.top = "150%";
assert_approx_equals(window.visualViewport.scale, 2, 0.2,
"window.visualViewport.scale reflects pinch-zoom level");
},
'Tester pinch zoomed in correctly',
'5. Scroll fully to the bottom right. Click the continue button ' +
'there.');
addManualTestStep(
function() {
var fullscreenBox = document.getElementById('fullscreenBox');
var expectedLeft = fullscreenBox.clientWidth / 2;
var expectedTop = fullscreenBox.clientHeight / 2;
var viewOffsetLeft = window.visualViewport.offsetLeft;
var viewOffsetTop = window.visualViewport.offsetTop;
// This needs to happen before assertions in case they fail. A
// failed assertion stops running this function.
continueBtn.style.position = "";
continueBtn.style.left = "";
continueBtn.style.top = "";
window.scrollTo(0, 0);
assert_approx_equals(viewOffsetLeft, expectedLeft, 10,
"OffsetLeft is correct");
assert_approx_equals(viewOffsetTop, expectedTop, 10,
"OffsetTop");
},
'OffsetLeft and OffsetTop correct when there\'s some layout ' +
'viewport scrolling as well.',
'6. Pinch-zoom out fully');
addManualTestStep(
function() {
continueBtn.remove();
},
null,
'Test Complete');
</script>
</html>