css/css-flexbox/inline-flex-column-image-load.html

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Inline-flex column container should size to image after async load</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#algo-cross-item">
<link rel="match" href="inline-flex-column-image-load-ref.html">
<meta name="assert" content="
  An inline-flex container with flex-direction: column should update its
  width when a child image finishes loading asynchronously.
">
<style>
.parent {
    display: inline-flex;
    flex-direction: column;
    background: green;
}
</style>
<p>Test passes if there is a filled green square.</p>
<div class="parent">
    <img id="img">
</div>
<script>
var img = document.getElementById('img');
img.onload = function() {
    document.documentElement.classList.remove('reftest-wait');
};
// Force layout before setting src so image loads asynchronously
document.body.offsetHeight;
// 100x100 fully transparent PNG; the green comes from the parent's background
img.src = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAYAAABw4pVUAAAAPklEQVR42u3BMQEAAADCoPVPbQsvoAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAgKcBnKQAAdh7HF4AAAAASUVORK5CYII=';
</script>