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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<meta name="flags" content="ahem"/>
<meta name="assert"
content="WebKit and Blink had a bug that a negative margin was applied
incorrectly if float's writing-mode was different from the
container's writing-mode. This test verifies a browser has no
such bug."/>
<link rel="match" href="reference/shape-image-000-ref.html"/>
<link rel="stylesheet" href="/fonts/ahem.css" />
<style>
.container {
width: 100px;
font: 10px/1 Ahem;
background-color: red;
color: rgb(0, 100, 0);
overflow: hidden;
}
#f {
display: inline-block;
width: 100px;
height: 100px;
background: url(support/left-half-rectangle.png);
shape-outside: url(support/left-half-rectangle.png);
float: left;
margin-left: -10px;
writing-mode: vertical-lr;
}
</style>
<p>The test passes if you see a solid green square. There should be no red.</p>
<div class="container"><span id="f"></span>
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</div>
<script>
// A workaround of an issue of Chromium content_shell. It finishes a test
// without waiting images linked from url(). crbug.com/372756068
const image = new Image();
image.src = 'support/left-half-rectangle.png';
image.addEventListener('load', () => {
image.remove();
requestAnimationFrame(() => {
requestAnimationFrame(() => {
document.documentElement.classList.remove('reftest-wait');
});
});
});
document.body.appendChild(image);
</script>
</html>