1 files changed, 146 insertions, 0 deletions
diff --git a/widget/tests/browser/browser_test_scrollbar_colors.js b/widget/tests/browser/browser_test_scrollbar_colors.js
new file mode 100644
index 0000000000..2152412071
--- /dev/null
+++ b/widget/tests/browser/browser_test_scrollbar_colors.js
@@ -0,0 +1,146 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+
+"use strict";
+
+add_task(async () => {
+  const URL_ROOT = getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content/",
+    "http://mochi.test:8888/"
+  );
+
+  const tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    URL_ROOT + "helper_scrollbar_colors.html"
+  );
+
+  await SpecialPowers.spawn(tab.linkedBrowser, [], () => {
+    ChromeUtils.defineESModuleGetters(this, {
+      WindowsVersionInfo:
+        "resource://gre/modules/components-utils/WindowsVersionInfo.sys.mjs",
+    });
+
+    Services.scriptloader.loadSubScript(
+      "chrome://mochikit/content/tests/SimpleTest/WindowSnapshot.js",
+      this
+    );
+
+    // == Native theme ==
+
+    const WIN_REFERENCES = [
+      // Yellow background
+      ["255,255,0", 6889],
+      // Blue scrollbar face
+      ["0,0,255", 540],
+      // Cyan scrollbar track
+      ["0,255,255", 2487],
+    ];
+
+    const MAC_REFERENCES = [
+      // Yellow background
+      ["255,255,0", 7225],
+      // Blue scrollbar face
+      ["0,0,255", 416],
+      // Cyan scrollbar track
+      ["0,255,255", 1760],
+    ];
+
+    // Values have been updated from 8100, 720, 1180 for linux1804
+    const LINUX_REFERENCES = [
+      // Yellow background
+      ["255,255,0", 7744],
+      // Blue scrollbar face
+      ["0,0,255", 1104],
+      // Cyan scrollbar track
+      ["0,255,255", 1152],
+    ];
+
+    // == Non-native theme ==
+
+    const WIN10_NNT_REFERENCES = [
+      // Yellow background
+      ["255,255,0", 6889],
+      // Blue scrollbar face
+      ["0,0,255", 612],
+      // Cyan scrollbar track
+      ["0,255,255", 2355],
+    ];
+
+    const WIN11_NNT_REFERENCES = [
+      // Yellow background
+      ["255,255,0", 6889],
+      // Blue scrollbar face
+      ["0,0,255", 324],
+      // Cyan scrollbar track
+      ["0,255,255", 2787],
+    ];
+
+    const MAC_NNT_REFERENCES = MAC_REFERENCES;
+
+    const LINUX_NNT_REFERENCES = [
+      // Yellow background
+      ["255,255,0", 7744],
+      // Blue scrollbar face
+      ["0,0,255", 368],
+      // Cyan scrollbar track
+      ["0,255,255", 1852],
+    ];
+
+    function countPixels(canvas) {
+      let result = new Map();
+      let ctx = canvas.getContext("2d");
+      let image = ctx.getImageData(0, 0, canvas.width, canvas.height);
+      let data = image.data;
+      let size = image.width * image.height;
+      for (let i = 0; i < size; i++) {
+        let key = data.subarray(i * 4, i * 4 + 3).toString();
+        let value = result.get(key);
+        value = value ? value : 0;
+        result.set(key, value + 1);
+      }
+      return result;
+    }
+
+    let outer = content.document.querySelector(".outer");
+    let outerRect = outer.getBoundingClientRect();
+    if (
+      outerRect.width == outer.clientWidth &&
+      outerRect.height == outer.clientHeight
+    ) {
+      ok(true, "Using overlay scrollbar, skip this test");
+      return;
+    }
+    content.document.querySelector("#style").textContent = `
+        .outer { scrollbar-color: blue cyan; }
+      `;
+
+    let canvas = snapshotRect(content.window, outerRect);
+    let stats = countPixels(canvas);
+    let isNNT = SpecialPowers.getBoolPref("widget.non-native-theme.enabled");
+
+    let references;
+    if (content.navigator.platform.startsWith("Win")) {
+      if (!isNNT) {
+        references = WIN_REFERENCES;
+      } else if (WindowsVersionInfo.get().buildNumber >= 22000) {
+        // Windows 11 NNT
+        references = WIN11_NNT_REFERENCES;
+      } else {
+        // Windows 10 NNT
+        references = WIN10_NNT_REFERENCES;
+      }
+    } else if (content.navigator.platform.startsWith("Mac")) {
+      references = isNNT ? MAC_NNT_REFERENCES : MAC_REFERENCES;
+    } else if (content.navigator.platform.startsWith("Linux")) {
+      references = isNNT ? LINUX_NNT_REFERENCES : LINUX_REFERENCES;
+    } else {
+      ok(false, "Unsupported platform");
+    }
+    for (let [color, count] of references) {
+      let value = stats.get(color);
+      is(value, count, `Pixel count of color ${color}`);
+    }
+  });
+
+  BrowserTestUtils.removeTab(tab);
+});