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diff --git a/devtools/server/tests/chrome/inactive-property-helper/place-items-content.mjs b/devtools/server/tests/chrome/inactive-property-helper/place-items-content.mjs
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+++ b/devtools/server/tests/chrome/inactive-property-helper/place-items-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 `place-items` and `place-content` test cases.
+export default [
+  {
+    info: "place-items is inactive on block element",
+    property: "place-items",
+    tagName: "div",
+    rules: ["div { place-items: center; }"],
+    isActive: false,
+  },
+  {
+    info: "place-items is inactive on inline element",
+    property: "place-items",
+    tagName: "span",
+    rules: ["span { place-items: center; }"],
+    isActive: false,
+  },
+  {
+    info: "place-items is inactive on flex item",
+    property: "place-items",
+    createTestElement: rootNode => {
+      const container = document.createElement("div");
+      const element = document.createElement("span");
+      container.append(element);
+      rootNode.append(container);
+      return element;
+    },
+    rules: [
+      "div { display: flex; align-items: start; }",
+      "span { place-items: center; }",
+    ],
+    ruleIndex: 1,
+    isActive: false,
+  },
+  {
+    info: "place-items is inactive on grid item",
+    property: "place-items",
+    createTestElement: rootNode => {
+      const container = document.createElement("div");
+      const element = document.createElement("span");
+      container.append(element);
+      rootNode.append(container);
+      return element;
+    },
+    rules: [
+      "div { display: grid; align-items: start; }",
+      "span { place-items: center; }",
+    ],
+    ruleIndex: 1,
+    isActive: false,
+  },
+  {
+    info: "place-items is active on flex container",
+    property: "place-items",
+    tagName: "div",
+    rules: ["div { place-items: center;  display: flex;}"],
+    isActive: true,
+  },
+  {
+    info: "place-items is active on inline-flex container",
+    property: "place-items",
+    tagName: "div",
+    rules: ["div { place-items: center;  display: inline-flex;}"],
+    isActive: true,
+  },
+  {
+    info: "place-items is active on grid container",
+    property: "place-items",
+    tagName: "div",
+    rules: ["div { place-items: center;  display: grid;}"],
+    isActive: true,
+  },
+  {
+    info: "place-items is active on inline grid container",
+    property: "place-items",
+    tagName: "div",
+    rules: ["div { place-items: center;  display: inline-grid;}"],
+    isActive: true,
+  },
+  {
+    info: "place-content is inactive on block element",
+    property: "place-content",
+    tagName: "div",
+    rules: ["div { place-content: center; }"],
+    isActive: false,
+  },
+  {
+    info: "place-content is inactive on inline element",
+    property: "place-content",
+    tagName: "span",
+    rules: ["span { place-content: center; }"],
+    isActive: false,
+  },
+  {
+    info: "place-content is inactive on flex item",
+    property: "place-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; align-items: start; }",
+      "span { place-content: center; }",
+    ],
+    ruleIndex: 1,
+    isActive: false,
+  },
+  {
+    info: "place-content is inactive on grid item",
+    property: "place-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; align-items: start; }",
+      "span { place-content: center; }",
+    ],
+    ruleIndex: 1,
+    isActive: false,
+  },
+  {
+    info: "place-content is active on flex container",
+    property: "place-content",
+    tagName: "div",
+    rules: ["div { place-content: center;  display: flex;}"],
+    isActive: true,
+  },
+  {
+    info: "place-content is active on inline-flex container",
+    property: "place-content",
+    tagName: "div",
+    rules: ["div { place-content: center;  display: inline-flex;}"],
+    isActive: true,
+  },
+  {
+    info: "place-content is active on grid container",
+    property: "place-content",
+    tagName: "div",
+    rules: ["div { place-content: center;  display: grid;}"],
+    isActive: true,
+  },
+  {
+    info: "place-content is active on inline grid container",
+    property: "place-content",
+    tagName: "div",
+    rules: ["div { place-content: center;  display: inline-grid;}"],
+    isActive: true,
+  },
+];