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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
iframe {
width: 1000px;
height: 1000px;
}
</style>
<script>
let scroller;
let box1;
let box2;
let frame;
const iframe_load_promise = new Promise((resolve) => {
frame = document.createElement("iframe");
frame.onload = async () => {
scroller = frame.contentDocument.getElementById("scroller");
box1 = frame.contentDocument.getElementById("box1");
box2 = frame.contentDocument.getElementById("box2");
resolve();
};
frame.src = "./layout-follows-focused-targeted-block-iframe.html#box2";
document.body.appendChild(frame);
});
const displacement = 150;
async function test_resnap(t, target) {
// Save box1's position and setup the cleanup.
const box1_left = box1.style.left;
t.add_cleanup(async () => {
// Reset box1's position.
box1.style.left = box1_left;
// Reset scroller's writing-mode.
scroller.style.writingMode = "horizontal-tb";
// Reset scroll position.
await waitForScrollReset(t, scroller);
});
assert_equals(scroller.scrollTop, 0, "scroll top is reset");
assert_equals(scroller.scrollLeft, 0, "scroll left is reset");
// Move box1 outside the scrollport by translating it 150px
// horizontally.
const new_left = box1.offsetLeft + displacement;
box1.style.left = `${new_left}px`;
assert_equals(scroller.scrollLeft, target.offsetLeft,
`scroller followed ${target.id} in x axis`);
assert_equals(scroller.scrollTop, target.offsetTop,
`scroller followed ${target.id} in y axis`);
}
promise_test(async (t) => {
await iframe_load_promise;
box1.focus();
assert_equals(frame.contentDocument.activeElement, box1,
"sanity check that box1 is focused.");
assert_equals(frame.contentDocument.querySelector(":target"), box2,
"sanity check that box2 is targeted.");
// box2 is targeted but box1 is focused, so box1 should be
// followed.
await test_resnap(t, box1);
// Remove focus from box1.
scroller.focus();
}, "focused area prefered over targeted area.");
promise_test(async (t) => {
await iframe_load_promise;
assert_not_equals(frame.contentDocument.activeElement, box1,
"sanity check that box1 is not focused.");
assert_equals(frame.contentDocument.querySelector(":target"), box2,
"sanity check that box2 is targeted.");
// box2 is targeted and box1 is not focused, so box2 should be
// followed.
await test_resnap(t, box2);
}, "targeted area prefered over non-focused area.");
promise_test(async (t) => {
await iframe_load_promise;
// Clear the targeted element.
frame.contentDocument.location.hash = "";
assert_equals(frame.contentDocument.querySelector(":target"), null,
"sanity check that no box is targeted.");
assert_not_equals(frame.contentDocument.activeElement, box1,
"sanity check that box1 is not focused.");
// Neither box is targeted or focused; so, the block axis target should
// be followed.
await test_resnap(t, box1);
}, "block axis area is preferred.");
promise_test(async (t) => {
await iframe_load_promise;
scroller.style.writingMode = "vertical-lr";
// Clear the targeted element.
frame.contentDocument.location.hash = "";
assert_equals(frame.contentDocument.querySelector(":target"), null,
"sanity check that no box is targeted.");
assert_not_equals(frame.contentDocument.activeElement, box1,
"sanity check that box1 is not focused.");
// Neither box is targeted or focused; so, the block (x) axis target
// should be followed.
await test_resnap(t, box2);
}, "block axis area is preferred (vertical writing-mode).");
</script>
</body>
</html>
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