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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scroll-start-target*</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start-target">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
.spacer {
width: 1000px;
height: 1000px;
}
.scroller {
width: 300px;
height: 300px;
border: solid 1px black;
overflow: scroll;
margin: 0px;
position: absolute;
}
.box {
position: absolute;
width: 200px;
height: 200px;
}
.top_left {
top: 0px;
left: 0px;
background-color: red;
}
.center {
top: 200px;
left: 200px;
background-color: purple;
scroll-start-target: auto auto;
}
.bottom_right {
top: 400px;
left: 400px;
background-color: yellow;
}
</style>
<div class="scroller" id="user_scroller">
<div class="spacer"></div>
<div class="top_left box" id="user_top_left_box"></div>
<div class="center box"></div>
<div class="bottom_right box"></div>
</div>
<div class="scroller" id="programmatic_scroller" style="left: 500px">
<div class="spacer"></div>
<div class="top_left box" id="programmatic_top_left_box"></div>
<div class="center box"></div>
<div class="bottom_right box"></div>
</div>
<script>
async function user_scroll(scroller, current_offset, target_offset) {
return new test_driver.Actions().scroll(0, 0,
target_offset.x - current_offset.x,
target_offset.y - current_offset.y, { origin: scroller })
.send();
}
function programmatic_scroll(scroller, current_offset, target_offset) {
scroller.scrollTo(target_offset.x, target_offset.y);
}
async function test_scroll_start_target(test, scroller, msg, scrolling_function) {
await waitForCompositorCommit();
let top_left_box = document.getElementById("user_top_left_box");
let expected_scroll_top = top_left_box.getBoundingClientRect().height;
let expected_scroll_left = top_left_box.getBoundingClientRect().width;
assert_approx_equals(scroller.scrollTop, expected_scroll_top, 1,
"scroll-start-target sets initial vertical scroll position");
assert_approx_equals(scroller.scrollLeft, expected_scroll_left, 1,
"scroll-start-target sets initial horizontal scroll position");
let scrollend_promise = new Promise((resolve) => {
scroller.addEventListener("scrollend", resolve);
});
const current_offset = { x: scroller.scrollLeft, y: scroller.scrollTop };
const target_offset = {
x: current_offset.x + 100,
y: current_offset.y + 100
};
await scrolling_function(scroller, current_offset, target_offset);
// Only wait for scrollend if it is supported.
if (window.onscrollend == null || window.onscrollend != undefined) {
await scrollend_promise;
}
assert_approx_equals(scroller.scrollTop, target_offset.y, 1,
`${msg} (vertical)`);
assert_approx_equals(scroller.scrollLeft, target_offset.x, 1,
`${msg} (horizontal)`);
}
promise_test(async (t) => {
let scroller = document.getElementById("user_scroller");
const msg = "user scroll is not overriden in by scroll-start-target";
await test_scroll_start_target(t, scroller, msg, user_scroll);
}, "scroll-start-target does not override user scroll");
promise_test(async (t) => {
let scroller = document.getElementById("programmatic_scroller");
const msg = "programmatic scroll is not overriden in by scroll-start-target";
await test_scroll_start_target(t, scroller, msg, programmatic_scroll);
}, "scroll-start-target does not override programmatic scroll");
</script>
</body>
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