2 files changed, 41 insertions, 1 deletions
diff --git a/browser/base/content/test/forms/browser.toml b/browser/base/content/test/forms/browser.toml
index 33d73ba8bf..95b666369e 100644
--- a/browser/base/content/test/forms/browser.toml
+++ b/browser/base/content/test/forms/browser.toml
@@ -1,5 +1,5 @@
 [DEFAULT]
-prefs = ["gfx.font_loader.delay=0", "dom.select.showPicker.enabled=true"]
+prefs = ["gfx.font_loader.delay=0", "dom.select.showPicker.enabled=true", "font.minimum-size.x-western=9"]
 support-files = ["head.js"]
 
 ["browser_selectpopup.js"]
@@ -18,6 +18,8 @@ skip-if = ["os == 'linux'"] # Bug 1329991 - test fails intermittently on Linux b
 
 ["browser_selectpopup_large.js"]
 
+["browser_selectpopup_minFontSize.js"]
+
 ["browser_selectpopup_searchfocus.js"]
 fail-if = ["a11y_checks"] # Bug 1854233 input may not be labeled
 
diff --git a/browser/base/content/test/forms/browser_selectpopup_minFontSize.js b/browser/base/content/test/forms/browser_selectpopup_minFontSize.js
new file mode 100644
index 0000000000..d240c2d2d0
--- /dev/null
+++ b/browser/base/content/test/forms/browser_selectpopup_minFontSize.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// NOTE that this test expects "font.minimum-size.x-western=9" to be set
+// in the manifest.
+
+const PAGE = `
+<!doctype html>
+<body lang="en-US">
+<select>
+  <option style="font-size:24px">A</option>
+  <option style="font-size:6px">BCD</option>
+</select>
+`;
+
+add_task(async function () {
+  const url = "data:text/html," + encodeURI(PAGE);
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url,
+    },
+    async function (browser) {
+      let popup = await openSelectPopup("click");
+      let menuitems = popup.querySelectorAll("menuitem");
+      is(
+        getComputedStyle(menuitems[0]).fontSize,
+        "24px",
+        "font-size should be honored"
+      );
+      is(
+        getComputedStyle(menuitems[1]).fontSize,
+        "9px",
+        "minimum font-size should be honored"
+      );
+    }
+  );
+});