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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Basic test for inline editing host which has placeholder text with pseudo-element</title>
<style>
[contenteditable]:empty::before {
content: "Type something";
}
</style>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
"use strict";
addEventListener("load", () => {
const editingHost = document.querySelector("span[contenteditable]");
editingHost.focus();
test(() => {
document.execCommand("insertText", false, "X");
assert_equals(editingHost.innerHTML, "X");
}, "The editing host should have inserted text");
test(() => {
document.execCommand("delete");
assert_equals(editingHost.innerHTML, "");
}, "The editing host should have no text");
}, {once: true});
</script>
</head>
<body>
<span id="container">
<span contenteditable="true"></span>
</span>
</body>
</html>