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diff --git a/layout/reftests/flexbox/flexbox-dyn-insertAroundText-2.xhtml b/layout/reftests/flexbox/flexbox-dyn-insertAroundText-2.xhtml
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@@ -0,0 +1,107 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!--
+ This test verifies that we reconstruct frames as necessary, after content
+ (including whitespace & divs) is dynamically inserted as a child of a
+ flexbox. (Note that in cases where we know the whitespace is going to be
+ dropped, we don't bother reconstructing frames. This test is to be sure we
+ aren't overzealous with that optimization.)
+-->
+<html xmlns="http://www.w3.org/1999/xhtml"
+ class="reftest-wait">
+ <head>
+ <style>
+ body {
+ font-size: 10px;
+ }
+
+ div.inserted {
+ background: teal; /* To make inserted div elements stand out. */
+ }
+
+ div.flexbox {
+ border: 1px dashed blue;
+ width: 300px;
+ display: flex;
+ justify-content: space-around;
+ margin-bottom: 1px;
+ white-space: pre;
+ }
+ </style>
+ <script>
+ function insertNodeAtPosnInElem(aNodeToInsert, aPosn, aParentId) {
+ var parent = document.getElementById(aParentId);
+ var insertBeforeTarget = parent.firstChild;
+ for (var i = 0; i &lt; aPosn; i++) {
+ insertBeforeTarget = insertBeforeTarget.nextSibling;
+ }
+ parent.insertBefore(aNodeToInsert, insertBeforeTarget);
+ }
+
+ function createDivElem() {
+ var div = document.createElement("div");
+ div.setAttribute("class", "inserted");
+ div.appendChild(document.createTextNode("[NewDiv]"));
+ return div;
+ }
+
+ function tweak() {
+ // Inserting div, adjacent to inline content
+ // -----------------------------------------
+ insertNodeAtPosnInElem(createDivElem(), 0, "f0");
+ insertNodeAtPosnInElem(createDivElem(), 1, "f1");
+
+ // Inserting div and whitespace, before inline content
+ // ---------------------------------------------------
+ insertNodeAtPosnInElem(document.createTextNode(" "), 0, "f2");
+ insertNodeAtPosnInElem(createDivElem(), 0, "f2");
+
+ insertNodeAtPosnInElem(createDivElem(), 0, "f3");
+ insertNodeAtPosnInElem(document.createTextNode(" "), 0, "f3");
+
+ // Inserting div and whitespace, after inline content
+ // ---------------------------------------------------
+ insertNodeAtPosnInElem(document.createTextNode(" "), 1, "f4");
+ insertNodeAtPosnInElem(createDivElem(), 1, "f4");
+
+ insertNodeAtPosnInElem(createDivElem(), 1, "f5");
+ insertNodeAtPosnInElem(document.createTextNode(" "), 1, "f5");
+
+ // Inserting div and text, before inline content
+ // ---------------------------------------------------
+ insertNodeAtPosnInElem(document.createTextNode("[NewText]"), 0, "f6");
+ insertNodeAtPosnInElem(createDivElem(), 0, "f6");
+
+ insertNodeAtPosnInElem(createDivElem(), 0, "f7");
+ insertNodeAtPosnInElem(document.createTextNode("[NewText]"), 0, "f7");
+
+ // Inserting div and text, after inline content
+ // ---------------------------------------------------
+ insertNodeAtPosnInElem(document.createTextNode("[NewText]"), 1, "f8");
+ insertNodeAtPosnInElem(createDivElem(), 1, "f8");
+
+ insertNodeAtPosnInElem(createDivElem(), 1, "f9");
+ insertNodeAtPosnInElem(document.createTextNode("[NewText]"), 1, "f9");
+
+ document.documentElement.removeAttribute("class");
+ }
+
+ window.addEventListener("MozReftestInvalidate", tweak, false);
+ </script>
+ </head>
+ <body>
+ <div class="flexbox" id="f0">[OldText]</div>
+ <div class="flexbox" id="f1">[OldText]</div>
+ <div class="flexbox" id="f2">[OldText]</div>
+ <div class="flexbox" id="f3">[OldText]</div>
+ <div class="flexbox" id="f4">[OldText]</div>
+ <div class="flexbox" id="f5">[OldText]</div>
+ <div class="flexbox" id="f6">[OldText]</div>
+ <div class="flexbox" id="f7">[OldText]</div>
+ <div class="flexbox" id="f8">[OldText]</div>
+ <div class="flexbox" id="f9">[OldText]</div>
+ </body>
+</html>