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- This WPT test may be referenced by the following Test IDs:
- /css/css-flexbox/percentage-heights-019.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>CSS Flexbox Test: Test the percentage resolution of a child in a flex item that has an indefinite main size</title>
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="Per 9.8.4, once the outer flex container's cross size has been determined, the inner flex container's main size is considered definite. Then per 9.8.1, the item's post-flexing main size is also treated as definite. Therefore, in the final layout, the child's percentage block-size should be treated as resolvable and should be honored.">
<style>
.outer {
display: flex;
}
.inner {
display: flex;
flex-direction: column;
inline-size: 100px;
}
.item {
overflow: hidden; /* This is essential to reproduce the bug. */
min-block-size: 100px;
background: red;
}
.child {
block-size: 100%;
background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="outer">
<div class="inner">
<div class="item">
<div class="child"></div>
</div>
</div>
</div>
</html>