3 files changed, 99 insertions, 0 deletions
diff --git a/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-focus-001.tentative.html b/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-focus-001.tentative.html
new file mode 100644
index 0000000000..2ea0390eab
--- /dev/null
+++ b/testing/web-platform/tests/mathml/relations/html5-tree/tabindex-focus-001.tentative.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<title>Invalid tabindex</title>
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1128054">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<!-- Test default focusability -->
+<math></math>
+<math href="#" data-focusable=true></math>
+<!-- Test tabindex=0 focusability -->
+<math tabindex="0" data-focusable=true></math>
+<!-- Test tabindex=-1 focusability -->
+<math tabindex="-1" data-focusable=true></math>
+<!-- Test tabindex=invalid focusability -->
+<math tabindex="invalid"></math>
+<math href="#" tabindex="invalid" data-focusable=true></math>
+
+<script>
+  test(() => {
+    for (let element of document.querySelectorAll("math")) {
+      let focusable = element.dataset && element.dataset.focusable;
+      let desc = "<math";
+      for (let attr of ["href", "tabindex"]) {
+        if (element.hasAttribute(attr)) {
+          desc += ` ${attr}=${element.getAttribute(attr)}`;
+        }
+      }
+      desc += ">";
+      element.focus();
+      focusable ? assert_equals(document.activeElement, element, desc + " should be focusable")
+                : assert_not_equals(document.activeElement, element, desc + " should not be focusable");
+    }
+  }, "invalid tabindex attribute does not make the element focusable");
+</script>
diff --git a/testing/web-platform/tests/mathml/relations/text-and-math/mo-glyph-height-with-default-font-ref.html b/testing/web-platform/tests/mathml/relations/text-and-math/mo-glyph-height-with-default-font-ref.html
new file mode 100644
index 0000000000..5c295152ba
--- /dev/null
+++ b/testing/web-platform/tests/mathml/relations/text-and-math/mo-glyph-height-with-default-font-ref.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="UTF-8">
+    <title>mo glyph height with default font (reference)</title>
+  </head>
+  <body>
+    <div id="hider"
+         style="position:absolute; top:0; left:0; background-color:green;
+                height:1em; width:100%; z-index:1; padding-top:5px;
+                padding-bottom:5px;" />
+  </body>
+</html>
diff --git a/testing/web-platform/tests/mathml/relations/text-and-math/mo-glyph-height-with-default-font.html b/testing/web-platform/tests/mathml/relations/text-and-math/mo-glyph-height-with-default-font.html
new file mode 100644
index 0000000000..262d3b9277
--- /dev/null
+++ b/testing/web-platform/tests/mathml/relations/text-and-math/mo-glyph-height-with-default-font.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html class="reftest-wait">
+  <head>
+    <meta charset="UTF-8">
+    <title>mo glyph height with default font</title>
+    <meta name="assert" content="Verify operators with default fonts are not too tall.">
+    <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1219068"/>
+    <link rel="match" href="mo-glyph-height-with-default-font-ref.html"/>
+  </head>
+  <body>
+    <math style="position:absolute; top: 0; font-size:1em;  z-index: 0;" display="block">
+      <mrow>
+        <mo>|</mo>
+        <mrow>
+          <mi>f</mi>
+          <mrow>
+            <mn>(</mn>
+            <mi>x</mi>
+            <mn>)</mn>
+          </mrow>
+          <mn>−</mn>
+          <mrow>
+            <mi>f</mi>
+            <mrow>
+              <mn>(</mn>
+              <msub>
+                <mi>x</mi>
+                <mn>0</mn>
+              </msub>
+              <mn>)</mn>
+            </mrow>
+          </mrow>
+        </mrow>
+        <mo>|</mo>
+      </mrow>
+    </math>
+    <div id="hider"
+         style="position:absolute; top:0; left:0; background-color:green;
+                height:1em; width:100%; z-index:1; padding-top:5px;
+                padding-bottom:5px; visibility:hidden" />
+    <script>
+      function obscureMathML() {
+          var hider = document.getElementById("hider");
+          hider.style.visibility="visible";
+          // The math should now be completely obscured
+
+          document.documentElement.removeAttribute("class");
+      }
+      window.addEventListener("TestRendered", obscureMathML);
+    </script>
+  </body>
+</html>