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diff --git a/devtools/server/tests/chrome/inactive-property-helper/placeholder-pseudo-element.mjs b/devtools/server/tests/chrome/inactive-property-helper/placeholder-pseudo-element.mjs
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+++ b/devtools/server/tests/chrome/inactive-property-helper/placeholder-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 `placeholder-pseudo-element` test cases.
+
+//"baseline-source",
+//"direction",
+//"dominant-baseline",
+//"line-height",
+//"text-orientation",
+//"vertical-align",
+//"writing-mode",
+//"alignment-baseline",
+//"baseline-shift",
+//"initial-letter",
+//"text-box-trim",
+
+export default [
+  {
+    info: "baseline-source is inactive on ::placeholder",
+    property: "baseline-source",
+    tagName: "input",
+    rules: ["input::placeholder { baseline-source: first; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "direction is inactive on ::placeholder",
+    property: "direction",
+    tagName: "input",
+    rules: ["input::placeholder { direction: rtl; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "dominant-baseline is inactive on ::placeholder",
+    property: "dominant-baseline",
+    tagName: "input",
+    rules: ["input::placeholder { dominant-baseline: central; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "line-height is inactive on ::placeholder",
+    property: "line-height",
+    tagName: "input",
+    rules: ["input::placeholder { line-height: 2em; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "text-orientation is inactive on ::placeholder",
+    property: "text-orientation",
+    tagName: "input",
+    rules: ["input::placeholder { text-orientation: sideways; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "vertical-align is inactive on ::placeholder",
+    property: "vertical-align",
+    tagName: "input",
+    rules: ["input::placeholder { vertical-align: super; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "writing-mode is inactive on ::placeholder",
+    property: "writing-mode",
+    tagName: "input",
+    rules: ["input::placeholder { writing-mode: vertical-rl; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "alignment-baseline is inactive on ::placeholder",
+    property: "alignment-baseline",
+    tagName: "input",
+    rules: ["input::placeholder { alignment-baseline: central; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "baseline-shift is inactive on ::placeholder",
+    property: "baseline-shift",
+    tagName: "input",
+    rules: ["input::placeholder { baseline-shift: super; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "initial-letter is inactive on ::placeholder",
+    property: "initial-letter",
+    tagName: "input",
+    rules: ["input::placeholder { initial-letter: 2em; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "text-box-trim is inactive on ::placeholder",
+    property: "text-box-trim",
+    tagName: "input",
+    rules: ["input::placeholder { text-box-trim: both; }"],
+    isActive: false,
+    expectedMsgId: "inactive-css-placeholder-pseudo-element-not-supported",
+  },
+  {
+    info: "color is active on ::placeholder",
+    property: "color",
+    tagName: "input",
+    rules: ["input::placeholder { color: green; }"],
+    isActive: true,
+  },
+  {
+    info: "display is active on ::placeholder",
+    property: "display",
+    tagName: "input",
+    rules: ["input::placeholder { display: grid; }"],
+    isActive: true,
+  },
+];