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<!doctype html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>scroll{Width,Height} with visible overflow and negative margins.</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#extension-to-the-element-interface">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1906475">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
body { margin: 0 }
.wrapper {
width: 80px;
height: 80px;
border: 1px solid #d1d1d2;
padding: 1px 4px 8px 16px;
border-width: 1px 2px 3px 4px;
border-right-width: 50px;
border-bottom-width: 40px;
}
.inner {
margin: -100px;
height: 300px;
width: 300px;
background-color: blue;
}
</style>
<div class="wrapper">
<div class="inner"></div>
</div>
<script>
const wrapper = document.querySelector(".wrapper");
const contentBox = {
width: 80,
height: 80,
};
const paddingBox = {
width: contentBox.width + 4 + 16,
height: contentBox.height + 1 + 8,
};
function* writingModes() {
yield "horizontal-tb";
yield* ["vertical-lr", "vertical-rl"].filter(writingMode => CSS.supports("writing-mode", writingMode));
}
for (let display of ["flow-root", "flex", "grid"]) {
for (let flexDirection of ["row", "row-reverse", "column", "column-reverse"]) {
if (flexDirection != "row" && display != "flex") {
// Don't bother retesting with all flexDirection values unless we're actually a flex container
continue;
}
for (let flexWrap of ["", "wrap-reverse"]) {
if (flexWrap != "" && display != "flex") {
// Don't bother retesting with all flexWrap values unless we're actually a flex container
continue;
}
for (let direction of ["ltr", "rtl"]) {
for (let writingMode of writingModes()) {
for (let overflow of ["visible", "hidden", "auto", "clip", "scroll"]) {
wrapper.style.display = display;
wrapper.style.overflow = overflow;
wrapper.style.direction = direction;
wrapper.style.writingMode = writingMode;
wrapper.style.flexDirection = flexDirection;
wrapper.style.flexWrap = flexWrap;
// Suppress scrollbars because they get added to the padding are
// and would need to account for them in flexbox.
wrapper.style.scrollbarWidth = display == "flex" ? "none" : "";
let vertical = writingMode.startsWith("vertical");
let scrollToTop = vertical && direction == "rtl";
let scrollToLeft = (!vertical && direction == "rtl") || writingMode == "vertical-rl";
let flexMainAxisIsVertical = flexDirection.startsWith("row") == vertical;
if (display == "flex") {
if (flexDirection.endsWith("-reverse")) {
if (flexMainAxisIsVertical) {
scrollToTop = !scrollToTop;
} else {
scrollToLeft = !scrollToLeft;
}
}
if (flexWrap == "wrap-reverse") {
if (flexMainAxisIsVertical) {
scrollToLeft = !scrollToLeft;
} else {
scrollToTop = !scrollToTop;
}
}
}
test(function() {
assert_greater_than_equal(wrapper.scrollWidth, paddingBox.width, "scrollWidth should be at least padding box width");
let padding = display == "flex" && !flexMainAxisIsVertical ? paddingBox.width - contentBox.width : 0;
assert_equals(wrapper.scrollWidth, (scrollToLeft ? 204 : 216) - padding, "scrollWidth");
}, "scrollWidth with negative margins: " + wrapper.style.cssText);
test(function() {
assert_greater_than_equal(wrapper.scrollHeight, paddingBox.height, "scrollHeight should be at least padding box height");
let padding = display == "flex" && flexMainAxisIsVertical ? paddingBox.width - contentBox.width : 0;
assert_equals(wrapper.scrollHeight, (scrollToTop ? 208 : 201) - padding, "scrollHeight");
}, "scrollHeight with negative margins: " + wrapper.style.cssText);
}
}
}
}
}
}
</script>
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