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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
<title>Tests that window should snap at user scroll end.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
margin: 0px;
scroll-snap-type: both mandatory;
}
#content {
width: 2000px;
height: 2000px;
padding: 0px;
margin: 0px;
}
#target {
position: relative;
left: 400px;
top: 400px;
width: 400px;
height: 400px;
background-color: lightblue;
overflow: hidden;
scroll-snap-align: start;
}
#i1 {
color: red;
font-weight: bold;
}
</style>
<div id="content">
<div id="target">
<h1>CSSScrollSnap</h1>
<h4>Tests that the window can snap at user scroll end.</h4>
<ol>
<li id="i1" style="color: red">
Scroll the page vertically and horizontally.
Keep scrolling until background has turned yellow.</li>
<li id="i2"> Press the button "Done"</li>
</ol>
<input type="button" id="btn" value="DONE" style="width: 100px; height: 50px;"/>
</div>
</div>
<script>
var snap_test = async_test('Tests that window should snap at user scroll end.');
var body = document.body;
var button = document.getElementById("btn");
var target = document.getElementById("target");
var instruction1 = document.getElementById("i1");
var instruction2 = document.getElementById("i2");
var scrolled_x = false;
var scrolled_y = false;
var start_x = window.scrollX;
var start_y = window.scrollY;
window.onscroll = function() {
if (scrolled_x && scrolled_y) {
body.style.backgroundColor = "yellow";
instruction1.style.color = "black";
instruction1.style.fontWeight = "normal";
instruction2.style.color = "red";
instruction2.style.fontWeight = "bold";
return;
}
scrolled_x |= window.scrollX != start_x;
scrolled_y |= window.scrollY != start_y;
}
button.onclick = function() {
if (!scrolled_x || !scrolled_y)
return;
snap_test.step(() => {
assert_equals(window.scrollX, target.offsetLeft,
"window.scrollX should be at snapped position.");
assert_equals(window.scrollY, target.offsetTop,
"window.scrollY should be at snapped position.");
});
// To make the test result visible.
var content = document.getElementById("content");
body.removeChild(content);
snap_test.done();
}
</script>
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