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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Multi-column: Scrollable Overflow Transform Dynamic Positioned Element</title>
<link rel="author" titlae="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-multicol/" />
<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#scrollable" />
<meta name="assert" content="Checks that changes on an element's transform contribute to the scrollable overflow on a positioned element in a multicol.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.container {
position: absolute;
width: 100px;
height: 100px;
overflow: auto;
background: silver;
border: solid thick;
}
.element {
width: 50px;
height: 50px;
background: lime;
}
</style>
<div style="column-count: 2;">
<div style="position: relative;">
<div id="container1" style="top: 0px;" class="container">
<div id="element1" style="transform: translateX(20px);" class="element"></div>
</div>
<div id="container2" style="top: 150px;" class="container">
<div id="element2" style="transform: translateY(30px);" class="element"></div>
</div>
<div id="container3" style="top: 300px;" class="container">
<div id="element3" style="transform: translate(20px, 30px);" class="element"></div>
</div>
</div>
</div>
<script>
test(() => {
assert_equals(container1.scrollWidth, 100);
element1.style.transform = "translateX(200px)";
assert_equals(container1.scrollWidth, 250);
}, "Check scrollWidth before and after transform chage");
test(() => {
assert_equals(container2.scrollHeight, 100);
element2.style.transform = "translateY(300px)";
assert_equals(container2.scrollHeight, 350);
}, "Check scrollHeight before and after transform chage");
test(() => {
assert_equals(container3.scrollWidth, 100);
assert_equals(container3.scrollHeight, 100);
element3.style.transform = "translate(200px, 300px)";
assert_equals(container3.scrollWidth, 250);
assert_equals(container3.scrollHeight, 350);
}, "Check scrollWidth and scrollHeight before and after transform chage");
</script>
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