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<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
.container {
float: left;
margin: 10px;
text-align: center;
inline-size: fit-content;
}
.multicol {
inline-size: 320px;
block-size: 120px;
border: solid;
background: lightgray;
}
.column {
float: left;
inline-size: 100px;
margin-inline-start: 10px;
}
.column:first-child {
margin-inline-start:0;
}
.clipper {
position: relative;
border-radius: 50px;
border: 20px solid blue;
overflow: clip;
background: red;
}
.clipper.part1 {
block-size: 100px;
border-block-end: none;
border-end-start-radius: 0;
border-end-end-radius: 0;
}
.clipper.part2 {
block-size: 120px;
border-block-start: none;
border-block-end: none;
border-radius: 0;
}
.clipper.part3 {
block-size: 80px;
border-block-start: none;
border-start-start-radius: 0;
border-start-end-radius: 0;
}
.child {
block-size: 300px;
background: yellow;
}
</style>
<p>In each figure there should be a yellow box with a rounded blue border around
it, split into three columns. There should be no red.</p>
<div class="container">
horizontal-tb:
<div class="multicol">
<div class="column">
<div class="clipper part1">
<div class="child"></div>
</div>
</div>
<div class="column">
<div class="clipper part2">
<div class="child"></div>
</div>
</div>
<div class="column">
<div class="clipper part3">
<div class="child"></div>
</div>
</div>
</div>
</div>
<div class="container">
vertical-rl:
<div class="multicol" style="writing-mode:vertical-rl;">
<div class="column">
<div class="clipper part1">
<div class="child"></div>
</div>
</div>
<div class="column">
<div class="clipper part2">
<div class="child"></div>
</div>
</div>
<div class="column">
<div class="clipper part3">
<div class="child"></div>
</div>
</div>
</div>
</div>
<div class="container">
vertical-lr:
<div class="multicol" style="writing-mode:vertical-lr;">
<div class="column">
<div class="clipper part1">
<div class="child"></div>
</div>
</div>
<div class="column">
<div class="clipper part2">
<div class="child"></div>
</div>
</div>
<div class="column">
<div class="clipper part3">
<div class="child"></div>
</div>
</div>
</div>
</div>