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scroll-snap-writing-mode-000.html
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<!DOCTYPE html>
<title>
scroll-snap-align vs writing-mode
</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-align">
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#re-snap">
<link rel="match" href="scroll-snap-writing-mode-000-ref.html">
<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">
<style>
.wrapper {
/* lay out in a nice grid */
display: grid;
gap: 0.25em;
grid-template-columns: repeat(6, max-content);
}
.scroller {
scroll-snap-type: both mandatory;
overflow: hidden;
scroll-padding: 0;
width: 50px;
height: 50px;
border: solid silver;
border-block-start-color: blue;
border-inline-start-color: blue;
}
.area {
width: 200px;
height: 200px;
}
.target {
margin: 5px;
scroll-snap-align: start;
}
.small .target {
width: 30px;
height: 30px;
background: orange;
}
.large .target {
width: 51px;
height: 51px;
border-block-end: 20px solid red;
border-inline-end: 20px solid red;
}
.large .target::before {
content: '';
display: block;
width: 30px;
height: 30px;
background: orange;
}
.TB { writing-mode: horizontal-tb; }
.LR { writing-mode: vertical-lr; }
.RL { writing-mode: vertical-rl; }
.ltr { direction: ltr; }
.rtl { direction: rtl; }
.TB.ltr.invert .target { writing-mode: vertical-rl; direction: rtl; }
.TB.rtl.invert .target { writing-mode: vertical-lr; direction: rtl; }
.LR.ltr.invert .target { writing-mode: vertical-rl; direction: rtl; }
.LR.rtl.invert .target { writing-mode: vertical-rl; direction: ltr; }
.RL.ltr.invert .target { writing-mode: vertical-lr; direction: rtl; }
.RL.rtl.invert .target { writing-mode: horizontal-tb; direction: ltr; }
.large.invert {
/* key off target‘s writing mode, which we just inverted */
border: solid silver;
border-block-end-color: blue;
border-inline-end-color: blue;
}
</style>
<p>Test passes if there is an orange square tucked into each blue corner without gaps,
and there is no red, except for the large inverted cases which should have red
in the silver corner and smaller orange boxes in the blue corner.
<div class="wrapper">
<!-- Simple Small Cases -->
<div class="scroller TB ltr small">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR ltr small">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL ltr small">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller TB rtl small">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR rtl small">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL rtl small">
<div class="area">
<div class="target"></div>
</div>
</div>
<!-- Target-inverted Small Cases
This row should be identical to the previous. -->
<div class="scroller TB ltr small invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR ltr small invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL ltr small invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller TB rtl small invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR rtl small invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL rtl small invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<!-- Simple Large Cases -->
<div class="scroller TB ltr large">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR ltr large">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL ltr large">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller TB rtl large">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR rtl large">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL rtl large">
<div class="area">
<div class="target"></div>
</div>
</div>
<!-- Target-inverted Large Cases
This is the fun one. -->
<div class="scroller TB ltr large invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR ltr large invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL ltr large invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller TB rtl large invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller LR rtl large invert">
<div class="area">
<div class="target"></div>
</div>
</div>
<div class="scroller RL rtl large invert">
<div class="area">
<div class="target"></div>
</div>
</div>
</div> <!-- wrapper -->