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Test Info:

<!DOCTYPE html>
<title>
CSS Gap Decorations: Subgrid gap segments are painted properly with empty areas. Tests
scenario where both parent and subgrid have empty cells.
</title>
<link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
<link rel="match" href="subgrid-gap-decorations-025-ref.html">
<link rel="author" title="Sam Davis Omekara Jr." href="mailto:samomekarajr@microsoft.com">
<style>
body {
margin: 0px;
}
.grid-container {
display: grid;
grid-template-columns: repeat(5, 1fr);
grid-template-rows: repeat(5, 1fr);
gap: 10px;
width: 140px;
height: 140px;
column-rule: skyblue solid 10px;
row-rule: cornflowerblue solid 10px;
row-rule-visibility-items: around;
column-rule-visibility-items: between;
}
.subgrid {
display: grid;
grid-template-columns: subgrid;
grid-template-rows: subgrid;
background: red;
grid-column: 2 / -2;
grid-row: 2 / -2;
column-rule: green solid 10px;
row-rule: blue solid 10px;
row-rule-visibility-items: between;
column-rule-visibility-items: around;
}
.item {
background: purple;
}
.subgrid-item{
background: orange;
}
</style>
<div class="grid-container">
<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" style="grid-row: 5; grid-column: 5;"></div>
<div class="item" style="grid-row: 5; grid-column: 3;"></div>
<div class="item" style="grid-row: 5; grid-column: 1;"></div>
<div class="subgrid">
<div class="subgrid-item" style="grid-row: 1/3; grid-column:1/2;"></div>
<div class="subgrid-item" style="grid-row: 2/3; grid-column:2/3;"></div>
<div class="subgrid-item" style="grid-row: 3; grid-column:-3/-1;"></div>
</div>
</div>