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Test Info:

<!doctype html>
<html class="reftest-wait">
<title>CSS Scrollbars: paint test when updating scrollbar-width, with overflow:auto</title>
<link rel="author" title="Felipe Erias Morandeira" href="mailto:felipeerias@gmail.com" />
<link rel="match" href="scrollbar-width-paint-002-ref.html" />
<link rel="mismatch" href="scrollbar-width-paint-002-mis-ref.html" />
<link rel="help" href="https://www.w3.org/TR/css-scrollbars-1/" />
<script src="/common/reftest-wait.js"></script>
<style>
body {
display: flex;
flex-wrap: wrap;
}
.container {
scrollbar-gutter: stable;
overflow: scroll;
flex: 0 0;
height: 200px;
min-width: 200px;
margin: 1px;
padding: 0px;
border: none;
background: deepskyblue;
}
.content {
height: 100%;
width: 100%;
}
.container.auto {
scrollbar-width: auto;
}
.container.thin {
scrollbar-width: thin;
}
.container.none {
scrollbar-width: none;
}
.content.plain {
background: red;
}
.content.gradient {
background: linear-gradient(135deg, red, blue);
}
</style>
<div id="one" class="container auto">
<div class="content plain"></div>
</div>
<div id="two" class="container thin">
<div class="content plain"></div>
</div>
<div id="three" class="container none">
<div class="content plain"></div>
</div>
<div id="four" class="container auto">
<div class="content gradient"></div>
</div>
<div id="five" class="container thin">
<div class="content gradient"></div>
</div>
<div id="six" class="container none">
<div class="content gradient"></div>
</div>
<script>
requestAnimationFrame(() => requestAnimationFrame(() => {
document.getElementById('one').style.scrollbarWidth = 'thin';
document.getElementById('two').style.scrollbarWidth = 'auto';
document.getElementById('three').style.scrollbarWidth = 'auto';
document.getElementById('four').style.scrollbarWidth = 'none';
document.getElementById('five').style.scrollbarWidth = 'none';
document.getElementById('six').style.scrollbarWidth = 'thin';
takeScreenshot();
}));
</script>