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diff --git a/devtools/server/tests/chrome/inactive-property-helper/first-line-pseudo-element.mjs b/devtools/server/tests/chrome/inactive-property-helper/first-line-pseudo-element.mjs
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+++ b/devtools/server/tests/chrome/inactive-property-helper/first-line-pseudo-element.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 `first-line-pseudo-element` test cases.
+
+// "direction",
+// "text-orientation",
+// "writing-mode",
+
+export default [
+  {
+    info: "direction is inactive on ::first-line",
+    property: "direction",
+    tagName: "div",
+    rules: ["div::first-line { direction: rtl; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-first-line-pseudo-element-not-supported",
+  },
+  {
+    info: "text-orientation is inactive on ::first-line",
+    property: "text-orientation",
+    tagName: "div",
+    rules: ["div::first-line { text-orientation: sideways; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-first-line-pseudo-element-not-supported",
+  },
+  {
+    info: "writing-mode is inactive on ::first-line",
+    property: "writing-mode",
+    tagName: "div",
+    rules: ["div::first-line { writing-mode: vertical-rl; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-first-line-pseudo-element-not-supported",
+  },
+  {
+    info: "color is active on ::first-line",
+    property: "color",
+    tagName: "div",
+    rules: ["div::first-line { color: green; }"],
+    isActive: true,
+  },
+  {
+    info: "display is active on ::first-line",
+    property: "display",
+    tagName: "div",
+    rules: ["div::first-line { display: grid; }"],
+    isActive: true,
+  },
+];