| Index: LayoutTests/dialog/backdrop-in-flow.html
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| diff --git a/LayoutTests/dialog/backdrop-in-flow.html b/LayoutTests/dialog/backdrop-in-flow.html
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| new file mode 100644
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| index 0000000000000000000000000000000000000000..5e8e25f60eae1b7d3471a941c82b8f733cd4340b
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| --- /dev/null
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| +++ b/LayoutTests/dialog/backdrop-in-flow.html
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| @@ -0,0 +1,36 @@
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| +<!DOCTYPE html>
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| +<style>
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| +dialog {
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| +    visibility: hidden;
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| +}
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| +
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| +dialog::backdrop {
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| +    height: 100px;
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| +    width: 50px;
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| +}
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| +
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| +#left::backdrop {
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| +    position: static;
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| +    top: 100px;
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| +    left: 100px;
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| +    background: green;
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| +}
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| +
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| +#right::backdrop {
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| +    position: relative;
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| +    background: green;
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| +    top: 100px;
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| +    left: 150px;
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| +}
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| +</style>
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| +<body>
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| +Test that position 'static' or 'relative' for ::backdrop computes to 'absolute'.
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| +The test passes if there is a single green box.
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| +<dialog id="left"></dialog>
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| +<dialog id="right"></dialog>
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| +</div>
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| +<script>
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| +document.querySelector('#left').showModal();
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| +document.querySelector('#right').showModal();
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| +</script>
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| +</body>
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| 
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