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<!DOCTYPE html>
<title>Reference for default scroll() timeline with vertical-rl</title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<style>
html {
min-block-size: 100%;
padding-block-end: 100px;
writing-mode: vertical-rl
}
#box {
width: 100px;
height: 100px;
background-color: green;
transform: translateX(-100px);
}
* {
margin-block: 0px;
}
</style>
<div id="box"></div>
<script>
window.addEventListener('load', function() {
// Move the scroller to halfway.
const scroller = document.scrollingElement;
const maxScroll = scroller.scrollWidth - scroller.clientWidth;
scroller.scrollLeft = -0.5 * maxScroll;
});
</script>