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+<script>
+function onLoad() {
+ const shadow = document.querySelector("shadow");
+ // For emulating the traditional behavior, collapse Selection to end of the
+ // <shadow> which is the deepest last child of the <body>.
+ getSelection().collapse(shadow, shadow.childNodes.length);
+ try {
+ document.querySelector("dd[contenteditable]").addEventListener(
+ "DOMNodeInserted",
+ () => {
+ try {
+ shadow.replaceWith("1");
+ } catch(e) {}
+ }
+ );
+ } catch(e) {}
+ try {
+ document.execCommand("justifyFull");
+ } catch(e) {}
+}
+</script>
+<body onload="onLoad();">
+<dd contenteditable>
+<shadow></body>