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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-inline/model/phantom-line-boxes-004.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Inline Layout Model: Phantom Line Boxes</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="match" href="../../reference/ref-filled-green-200px-square.html">
<meta name="assert" content="Non-zero inline-axis margins, padding, or borders
prevent a line box from becoming a phantom line box, and therefore prevent
the inline formatting context from collapsing margins through.
This test checks negative margins.">
<style>
.wrapper {
float: left;
width: 50px;
background: red;
}
.wrapper.phantom {
background: green;
}
.wrapper > div {
line-height: 0;
background: green;
}
.wrapper.phantom > div {
background: red
}
.wrapper > div::after {
content: "";
display: flow-root;
margin-top: 200px;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="wrapper phantom">
<div><span style="margin-top: -1px"></span></div>
</div>
<div class="wrapper phantom">
<div><span style="margin-bottom: -1px"></span></div>
</div>
<div class="wrapper">
<div><span style="margin-left: -1px"></span></div>
</div>
<div class="wrapper">
<div><span style="margin-right: -1px"></span></div>
</div>