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chromium/third_party/blink/web_tests/editing/deleting/5369009.html 

<!doctype html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../assert_selection.js"></script>
<script>
// This tests for a hang on delete where a style rule would cause style spans
// in content moved after the delete to be displayed as blocks. You should see
// Hello<b>World</b> below.
selection_test(
    [
        '<style>#d1 span { float:right; }</style>',
        '<div contenteditable>',
            '<div id="d1">Hello</div>',
            '<div id="d2" style="font-weight:bold">|World</div>',
        '</div>',
    ],
    'Delete',
    [
        '<style>#d1 span { float:right; }</style>',
        '<div contenteditable>',
            '<div id="d1">',
                'Hello|',
                '<span style="font-weight: bold; float: none;">World</span>',
            '</div>',
        '</div>',
    ]);
</script>