| Index: LayoutTests/dialog/dialogs-with-no-backdrop.html
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| diff --git a/LayoutTests/dialog/dialogs-with-no-backdrop.html b/LayoutTests/dialog/dialogs-with-no-backdrop.html
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| new file mode 100644
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| index 0000000000000000000000000000000000000000..38a5943f9e2e04720dd4b99982f11431c7534ad8
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| --- /dev/null
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| +++ b/LayoutTests/dialog/dialogs-with-no-backdrop.html
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| @@ -0,0 +1,38 @@
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| +<!DOCTYPE html>
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| +<style>
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| +dialog::backdrop {
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| +    position: absolute;
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| +    top: 100px;
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| +    left: 100px;
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| +    height: 100px;
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| +    width: 100px;
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| +    background: red;
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| +}
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| +
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| +#display-none-backdrop::backdrop {
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| +    display: none;
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| +}
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| +</style>
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| +<body>
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| +Test that ::backdrop is not shown for non-open or non-modal dialogs.
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| +The test passes if there is no red shown.
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| +<dialog id="never-opened-dialog"></dialog>
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| +<dialog id="display-none-dialog" style="display: none"></dialog>
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| +<dialog id="non-modal-dialog" style="visibility: hidden"></dialog>
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| +<dialog id="display-none-backdrop" style="visibility: hidden"></dialog>
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| +<dialog id="closed-dialog"></dialog>
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| +<dialog id="removed-dialog"></dialog>
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| +<script>
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| +document.getElementById('display-none-dialog').showModal();
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| +document.getElementById('non-modal-dialog').show();
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| +document.getElementById('display-none-backdrop').showModal();
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| +
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| +var closedDialog = document.getElementById('closed-dialog');
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| +closedDialog.showModal();
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| +closedDialog.close();
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| +
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| +var removedDialog = document.getElementById('removed-dialog');
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| +removedDialog.showModal();
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| +removedDialog.parentNode.removeChild(removedDialog);
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| +</script>
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| +</body>
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| 
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