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diff --git a/devtools/server/tests/chrome/inactive-property-helper/align-content.mjs b/devtools/server/tests/chrome/inactive-property-helper/align-content.mjs
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+/* 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/. */
+
+// InactivePropertyHelper `align-content` test cases.
+
+export default [
+  {
+    info: "align-content is inactive on block elements (until bug 1105571 is fixed)",
+    property: "align-content",
+    tagName: "div",
+    rules: ["div { align-content: center; }"],
+    isActive: false,
+  },
+  {
+    info: "align-content is active on flex containers",
+    property: "align-content",
+    tagName: "div",
+    rules: ["div { align-content: center; display: flex; }"],
+    isActive: true,
+  },
+  {
+    info: "align-content is active on grid containers",
+    property: "align-content",
+    tagName: "div",
+    rules: ["div { align-content: center; display: grid; }"],
+    isActive: true,
+  },
+  {
+    info: "align-content is inactive on flex items",
+    property: "align-content",
+    createTestElement: rootNode => {
+      const container = document.createElement("div");
+      const element = document.createElement("span");
+      container.append(element);
+      rootNode.append(container);
+      return element;
+    },
+    rules: ["div { display: flex; }", "span { align-content: center; }"],
+    ruleIndex: 1,
+    isActive: false,
+  },
+  {
+    info: "align-content is inactive on grid items",
+    property: "align-content",
+    createTestElement: rootNode => {
+      const container = document.createElement("div");
+      const element = document.createElement("span");
+      container.append(element);
+      rootNode.append(container);
+      return element;
+    },
+    rules: ["div { display: grid; }", "span { align-content: center; }"],
+    ruleIndex: 1,
+    isActive: false,
+  },
+  {
+    info: "align-content:baseline is active on flex items",
+    property: "align-content",
+    createTestElement: rootNode => {
+      const container = document.createElement("div");
+      const element = document.createElement("span");
+      container.append(element);
+      rootNode.append(container);
+      return element;
+    },
+    rules: ["div { display: flex; }", "span { align-content: baseline; }"],
+    ruleIndex: 1,
+    isActive: true,
+  },
+  {
+    info: "align-content:baseline is active on grid items",
+    property: "align-content",
+    createTestElement: rootNode => {
+      const container = document.createElement("div");
+      const element = document.createElement("span");
+      container.append(element);
+      rootNode.append(container);
+      return element;
+    },
+    rules: ["div { display: grid; }", "span { align-content: baseline; }"],
+    ruleIndex: 1,
+    isActive: true,
+  },
+  {
+    info: "align-content:baseline is active on table cells",
+    property: "align-content",
+    tagName: "div",
+    rules: ["div { display: table-cell; align-content: baseline; }"],
+    isActive: true,
+  },
+];