1 files changed, 38 insertions, 0 deletions
diff --git a/dom/html/test/browser_ImageDocument_svg_zoom.js b/dom/html/test/browser_ImageDocument_svg_zoom.js
new file mode 100644
index 0000000000..49e0fe410c
--- /dev/null
+++ b/dom/html/test/browser_ImageDocument_svg_zoom.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const URL = `data:image/svg+xml,<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"><rect width="100" height="100" fill="green"/></svg>`;
+
+function test_once() {
+  return BrowserTestUtils.withNewTab(URL, async browser => {
+    return await SpecialPowers.spawn(browser, [], async function () {
+      const rect = content.document.documentElement.getBoundingClientRect();
+      info(
+        `${rect.width}x${rect.height}, ${content.innerWidth}x${content.innerHeight}`
+      );
+      is(
+        Math.round(rect.height),
+        content.innerHeight,
+        "Should fill the viewport and not overflow"
+      );
+    });
+  });
+}
+
+add_task(async function test_with_no_text_zoom() {
+  await test_once();
+});
+
+add_task(async function test_with_text_zoom() {
+  let dpi = window.devicePixelRatio;
+
+  await SpecialPowers.pushPrefEnv({ set: [["ui.textScaleFactor", 200]] });
+  ok(
+    window.devicePixelRatio > dpi,
+    "DPI should change as a result of the pref flip"
+  );
+
+  return test_once();
+});