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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/">
<p>There should be no red below.</p>
<div id="container" style="writing-mode:vertical-rl; overflow:auto; width:300px; height:300px;">
<div style="width:300px; background:red;"></div>
<div style="width:400px; font-size:16px; line-height:25px;">
<span id="displayMe" style="color:red; display:none;">
FAIL<br>FAIL<br>FAIL<br>FAIL<br>
</span>
line<br>
</div>
<div id="displayMeToo" style="display:none; width:300px; background:red;"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(()=> {
var container = document.getElementById("container");
var displayMe = document.getElementById("displayMe");
var displayMeToo = document.getElementById("displayMeToo");
// Scroll the text container into view.
container.scrollLeft = -300;
displayMe.style.display = "inline";
displayMeToo.style.display = "block";
assert_equals(container.scrollLeft, -400);
}, "Line at edge of scrollport shouldn't jump visually when content is inserted before");
</script>
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