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diff --git a/devtools/server/tests/chrome/inactive-property-helper/vertical-align.mjs b/devtools/server/tests/chrome/inactive-property-helper/vertical-align.mjs
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+++ b/devtools/server/tests/chrome/inactive-property-helper/vertical-align.mjs
@@ -0,0 +1,56 @@
+/* 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 `vertical-align` test cases.
+export default [
+  {
+    info: "vertical-align is inactive on a block element",
+    property: "vertical-align",
+    tagName: "div",
+    rules: ["div { vertical-align: top; }"],
+    isActive: false,
+  },
+  {
+    info: "vertical-align is inactive on a span with display block",
+    property: "vertical-align",
+    tagName: "span",
+    rules: ["span { vertical-align: top; display: block;}"],
+    isActive: false,
+  },
+  {
+    info: "vertical-align is active on a div with display inline-block",
+    property: "vertical-align",
+    tagName: "div",
+    rules: ["div { vertical-align: top; display: inline-block;}"],
+    isActive: true,
+  },
+  {
+    info: "vertical-align is active on a table-cell",
+    property: "vertical-align",
+    tagName: "div",
+    rules: ["div { vertical-align: top; display: table-cell;}"],
+    isActive: true,
+  },
+  {
+    info: "vertical-align is active on a block element ::first-letter",
+    property: "vertical-align",
+    tagName: "div",
+    rules: ["div::first-letter { vertical-align: top; }"],
+    isActive: true,
+  },
+  {
+    info: "vertical-align is active on a block element ::first-line",
+    property: "vertical-align",
+    tagName: "div",
+    rules: ["div::first-line { vertical-align: top; }"],
+    isActive: true,
+  },
+  {
+    info: "vertical-align is active on an inline element",
+    property: "vertical-align",
+    tagName: "span",
+    rules: ["span { vertical-align: top; }"],
+    isActive: true,
+  },
+];