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+<!DOCTYPE html>
+<html class="reftest-wait">
+<head>
+ <meta charset="UTF-8">
+ <!-- This testcase ensures that we correctly re-evaluate the percent width on
+ the purple flex item "itemA", in response to the width of its flex
+ container changing due to the other item gaining some more content. -->
+ <style>
+ #flex {
+ display: inline-flex;
+ border: 1px solid black;
+ }
+ #itemA {
+ background: purple;
+ width: 50%;
+ flex: none;
+ }
+ #itemB {
+ background: lightblue;
+ flex: none;
+ }
+ </style>
+ <script>
+ function tweak() {
+ document.getElementById("itemB").innerText = "BBBBB";
+ document.documentElement.removeAttribute("class");
+ }
+ window.addEventListener("MozReftestInvalidate", tweak, false);
+ </script>
+</head>
+<body>
+ <div id="flex">
+ <div id="itemA"></div>
+ <div id="itemB">BB</div>
+ </div>
+</body>
+</html>