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<!DOCTYPE html>
<title>scroll properties for elements with css zoom</title>
<link rel="author" title="Yotam Hacohen" href="mailto:yotha@chromium.org">
<link rel="author" title="Google" href="http://www.google.com/">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scroll">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<head>
<style>
.container {
height: 100px;
width: 100px;
overflow: scroll;
}
.content {
height: 250px;
width: 250px;
background-image: linear-gradient(red, yellow);
}
#x4_zoom_container {
zoom: 4;
}
</style>
</head>
<body>
<div class="container" id="no_zoom_container">
<div class="content"></div>
</div>
<div class="container" id="x4_zoom_container">
<div class="content"></div>
</div>
<div class="container" id="container_with_zoomed_content">
<div class="content" style="zoom: 2;"></div>
</div>
<div style="zoom: 2;">
<div class="container" id="scroller_in_zoomed_element">
<div class="content"></div>
</div>
</div>
<script>
setup(() => {
window.noZoom = document.getElementById("no_zoom_container");
window.withZoom = document.getElementById("x4_zoom_container");
window.scrollerWithZoomContent = document.getElementById("container_with_zoomed_content");
window.scrollerInZoomedElement = document.getElementById("scroller_in_zoomed_element");
});
test(function() {
assert_true(!!noZoom, "no zoom target exists");
assert_true(!!withZoom, "zoom target exists");
});
test(function() {
// We remove zoom effects for scroll height and scroll width so values
// should be same for elements with and without zoom
// However scroll values should be changed by zoom on content
assert_equals(noZoom.scrollHeight, withZoom.scrollHeight, 'scrollHeight');
assert_equals(noZoom.scrollWidth, withZoom.scrollWidth, 'scrollWidth');
assert_equals(noZoom.scrollHeight*2, scrollerWithZoomContent.scrollHeight, 'scroll height for zoomed content');
assert_equals(noZoom.scrollWidth*2, scrollerWithZoomContent.scrollWidth, 'scroll width for zoomed content');
assert_equals(noZoom.scrollHeight, scrollerInZoomedElement.scrollHeight, 'scroll height for scroller in zoomed element');
assert_equals(noZoom.scrollWidth, scrollerInZoomedElement.scrollWidth, 'scroll width for scroller in zoomed element');
}, `scroll{Width, Height}`);
test(function() {
assert_equals(noZoom.scrollTop, 0, 'scrollTop should be 0');
assert_equals(noZoom.scrollLeft, 0, 'scrollLeft should be 0');
assert_equals(noZoom.scrollTop, withZoom.scrollTop, 'scrollTop');
assert_equals(noZoom.scrollLeft, withZoom.scrollLeft, 'scrollLeft');
noZoom.scrollTo(noZoom.scrollWidth / 2, noZoom.scrollHeight / 2);
withZoom.scrollTo(withZoom.scrollWidth / 2, withZoom.scrollHeight / 2);
assert_not_equals(noZoom.scrollTop, 0, 'scrollTop should not be 0');
assert_not_equals(noZoom.scrollLeft, 0, 'scrollLeft should not be 0');
assert_equals(noZoom.scrollTop, withZoom.scrollTop, 'scrollTop after scrollTo');
assert_equals(noZoom.scrollLeft, withZoom.scrollLeft, 'scrollLeft after scrollTo');
noZoom.scrollBy(2, 2);
withZoom.scrollBy(2, 2);
assert_equals(noZoom.scrollTop, withZoom.scrollTop, 'scrollTop after scrollBy');
assert_equals(noZoom.scrollLeft, withZoom.scrollLeft, 'scrollLeft after scrollBy');
}, `scroll{Top, Left}`);
</script>
</body>
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