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<!DOCTYPE html>
<link rel="author" title="Kevin Babbitt" href="mailto:kbabbitt@microsoft.com">
<style>
body {
margin: 0px;
}
.section {
position: relative;
margin-bottom: 20px;
}
.grid {
display: grid;
grid-template: repeat(3, 50px) / repeat(4, 50px);
gap: 10px;
width: 170px;
height: 230px;
}
.item {
background: lightgray;
}
.col-rule {
position: absolute;
height: 10px;
width: 170px;
}
.row-rule {
position: absolute;
width: 10px;
height: 230px;
top: 0px;
}
</style>
<!-- vertical-rl: inline=vertical T→B, block=horizontal R→L.
Column rules (horizontal) at y=50,110,170: red,green,blue (inline order).
Row rules (vertical) at x=110,50: orange,purple (block-start=right). -->
<div class="section">
<div class="col-rule" style="top: 50px; background: red;"></div>
<div class="col-rule" style="top: 110px; background: green;"></div>
<div class="col-rule" style="top: 170px; background: blue;"></div>
<div class="row-rule" style="left: 110px; background: orange;"></div>
<div class="row-rule" style="left: 50px; background: purple;"></div>
<div class="grid" style="writing-mode: vertical-rl;">
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
</div>
</div>
<!-- vertical-lr: inline=vertical T→B, block=horizontal L→R.
Column rules same as vertical-rl.
Row rules at x=50,110: orange,purple (block-start=left). -->
<div class="section">
<div class="col-rule" style="top: 50px; background: red;"></div>
<div class="col-rule" style="top: 110px; background: green;"></div>
<div class="col-rule" style="top: 170px; background: blue;"></div>
<div class="row-rule" style="left: 50px; background: orange;"></div>
<div class="row-rule" style="left: 110px; background: purple;"></div>
<div class="grid" style="writing-mode: vertical-lr;">
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
</div>
</div>
<!-- sideways-rl: same as vertical-rl. -->
<div class="section">
<div class="col-rule" style="top: 50px; background: red;"></div>
<div class="col-rule" style="top: 110px; background: green;"></div>
<div class="col-rule" style="top: 170px; background: blue;"></div>
<div class="row-rule" style="left: 110px; background: orange;"></div>
<div class="row-rule" style="left: 50px; background: purple;"></div>
<div class="grid" style="writing-mode: sideways-rl;">
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
</div>
</div>
<!-- sideways-lr: inline=vertical B→T, block=horizontal L→R.
Column rules reversed: red at y=170, green at y=110, blue at y=50.
Row rules same as vertical-lr. -->
<div class="section">
<div class="col-rule" style="top: 170px; background: red;"></div>
<div class="col-rule" style="top: 110px; background: green;"></div>
<div class="col-rule" style="top: 50px; background: blue;"></div>
<div class="row-rule" style="left: 50px; background: orange;"></div>
<div class="row-rule" style="left: 110px; background: purple;"></div>
<div class="grid" style="writing-mode: sideways-lr;">
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
<div class="item"></div><div class="item"></div><div class="item"></div>
</div>
</div>