Skip to content

Add test for overconstrained sticky view rectangle #55763

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Add test for overconstrained sticky view rectangle #55763

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
64 changes: 64 additions & 0 deletions css/css-position/sticky/position-sticky-top-and-bottom-overconstrained.html
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,64 @@
<!DOCTYPE html>
<title>position:sticky elements with height larger than the space available between top and bottom</title>
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="This test checks that the end edge is adjusted when the sticky view rectangle height ends up smaller than the height of the sticky element border box" />

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>

.scroller {
height: 100px;
overflow: auto;
position: relative;
}
.padding {
height: 200px;
}
.sticky {
position: sticky;
background: green;
top: 20px;
bottom: 0;
height: 200px;
}
</style>

<body>
<div class="scroller">
<div class="padding"></div>
<div class="sticky"></div>
<div class="padding"></div>
</div>
</body>

<script>
test(() => {
const scroller = document.querySelector('.scroller');
const element = document.querySelector('.sticky');
scroller.scrollTop = 0;
assert_equals(element.offsetTop, 0);
}, 'initially the sticky box should be pushed down by the sticky view rectangles top edge, the bottom edge being adjusted to accommodate the sticky element');

test(() => {
const scroller = document.querySelector('.scroller');
const element = document.querySelector('.sticky');
scroller.scrollTop = 160;
assert_equals(element.offsetTop, 180);
}, 'when we just above the flow position the sticky box should still be pushed down by the top edge, the bottom edge being adjusted to accommodate the sticky element');

test(() => {
const scroller = document.querySelector('.scroller');
const element = document.querySelector('.sticky');
scroller.scrollTop = 220;
assert_equals(element.offsetTop, 240);
}, 'when we scroll past the flow position the sticky box should still be pushed down by the top edge, the bottom edge being adjusted to accommodate the sticky element');

test(() => {
const scroller = document.querySelector('.scroller');
const element = document.querySelector('.sticky');
scroller.scrollTop = 500;
assert_equals(element.offsetTop, 400);
}, 'at the end the ticky box should be pushed up by the end of the scroll container');
</script>