Blitz - WPT: phantom-line-boxes-001.html

wpt / css / css-inline / model / phantom-line-boxes-001.html

/css/css-inline/model/phantom-line-boxes-001.html

<!DOCTYPE html>
<title>CSS Inline Layout Model: Phantom Line Boxes</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-inline/#invisible-line-boxes">
<link rel="help" href="https://drafts.csswg.org/css2/#collapsing-margins">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9344">
<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 non-zero padding.">

<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="padding-top: 1px"></span></div>
</div>
<div class="wrapper phantom">
  <div><span style="padding-bottom: 1px"></span></div>
</div>
<div class="wrapper">
  <div><span style="padding-left: 1px"></span></div>
</div>
<div class="wrapper">
  <div><span style="padding-right: 1px"></span></div>
</div>

/css/reference/ref-filled-green-200px-square.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reftest Reference</title>
<link rel="author" title="Javier Fernandez Garcia-Boente" href="jfernandez@igalia.com" />
<style>
div {
  background-color: green;
  height: 200px;
  width: 200px;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div></div>