import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/reftests/css-grid/support/ahem.css

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+@font-face {
+  font-family: "Ahem";
+  src: url(../../fonts/Ahem.ttf);
+}

layout/reftests/css-grid/support/dyn.js

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+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+ * vim: sw=2 ts=2 sts=2 et filetype=javascript
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function loadURL(url,callback) {
+  var xhttp = new XMLHttpRequest();
+  xhttp.onreadystatechange = function() {
+    if (xhttp.readyState == 4 && xhttp.status == 200) {
+      callback(xhttp.responseText);
+    }
+  };
+  xhttp.open("GET", url, true);
+  xhttp.send();
+}
+
+function dyn1(selector) {
+  // get an array of elements matching |selector|
+  var elems = Array.prototype.slice.call(document.querySelectorAll(selector))
+
+  // remove the first item in each grid
+  var removed = elems.map(function(e) {
+    var child = e.children[0];
+    if (child) {
+      var next = child.nextSibling;
+      e.removeChild(child);
+      return [ e, child, next ];
+    } else {
+      return null;
+    }
+  });
+
+  document.body.style.display = 'block';
+  document.body.offsetHeight;
+
+  // insert the removed item
+  removed.map(function(a) {
+    if (a) {
+      a[0].insertBefore(a[1],a[2]);
+    }
+  });
+}
+
+function dyn2(selector) {
+  // get an array of elements matching |selector|
+  var elems = Array.prototype.slice.call(document.querySelectorAll(selector))
+
+  // inject a new first item in each grid
+  var inserted = elems.map(function(e) {
+    var child = document.createElement('span');
+    e.insertBefore(child, e.firstChild);
+    return [ e, child ];
+  });
+
+  document.body.style.display = 'block';
+  document.body.offsetHeight;
+
+  // remove the inserted item
+  inserted.map(function(a) {
+    a[0].removeChild(a[1]);
+  });
+}
+
+function dyn3(selector) {
+  // get an array of elements matching |selector|
+  var elems = Array.prototype.slice.call(document.querySelectorAll(selector))
+
+  // remove the second item in each grid
+  var removed = elems.map(function(e) {
+    var child = e.children[1];
+    if (child) {
+      var next = child.nextSibling;
+      e.removeChild(child);
+      return [ e, child, next ];
+    } else {
+      return null;
+    }
+  });
+
+  document.body.style.display = 'block';
+  document.body.offsetHeight;
+
+  // insert the removed items
+  removed.map(function(a) {
+    if (a) {
+      a[0].insertBefore(a[1],a[2]);
+    }
+  });
+}
+
+function dyn4(selector) {
+  dyn3(selector);
+  dyn2(selector);
+}
+
+function dyn5(selector) {
+  // get an array of elements matching |selector|
+  var elems = Array.prototype.slice.call(document.querySelectorAll(selector))
+
+  // inject 20 new items in each grid
+  var inserted = elems.map(function(e) {
+    var a = new Array;
+    for (var i = 0; i < 20; ++i) {
+      var child = document.createElement('span');
+      e.insertBefore(child, e.firstChild);
+      a.push(child);
+    }
+    return [ e, a ];
+  });
+
+  document.body.style.display = 'block';
+  document.body.offsetHeight;
+
+  // remove the inserted item
+  inserted.map(function(a) {
+    a[1].forEach(function(child) {
+      a[0].removeChild(child);
+    });
+  });
+}
+
+function dynamicTest(url, callback) {
+  document.body.style.display='';
+  document.body.offsetHeight;
+  loadURL(url,callback);
+}