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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Writing Modes Test: body vertical-lr propagated to viewport - scroll direction</title>
<link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
<link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#principal-flow">
<meta name="assert" content="Test that propagating writing-mode from body to viewport affects scroll direction">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
html { writing-mode: vertical-rl; }
body { writing-mode: vertical-lr; width: 10000px; }
.result-wm, .result-wm > body {
writing-mode: horizontal-tb;
width: auto;
}
</style>
<body>
<script>
test(function() {
assert_equals(document.documentElement.scrollLeft, 0, "scrollLeft should be 0.");
}, "Check initial scroll position of viewport.");
test(function() {
document.documentElement.scrollLeft = -1000;
assert_equals(document.documentElement.scrollLeft, 0, "scrollLeft should be 0.");
}, "Scroll to scrollLeft = -1000 should not be possible.");
test(function() {
document.documentElement.scrollLeft = 1000;
assert_equals(document.documentElement.scrollLeft, 1000, "scrollLeft should be 1000.");
}, "Scroll to scrollLeft = 1000 should be possible.");
// Reset back to horizontal-tb to make the result readable on-screen.
document.documentElement.className = "result-wm";
</script>
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