diff --git a/testing/web-platform/tests/mathml/presentation-markup/operators/largeop-hit-testing.html b/testing/web-platform/tests/mathml/presentation-markup/operators/largeop-hit-testing.html
deleted file mode 100644
index 4f6a7782f279..000000000000
--- a/testing/web-platform/tests/mathml/presentation-markup/operators/largeop-hit-testing.html
+++ /dev/null
@@ -1,63 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8">
-<title>Test hit testing on large operators</title>
-<meta name="assert" content="Verify that hit testing works on large operators.">
-<script src="/resources/testharness.js"></script>
-<script src="/resources/testharnessreport.js"></script>
-<script src="/mathml/support/feature-detection.js"></script>
-<style>
-  @font-face {
-    font-family: TestFont;
-    src: url("/fonts/math/largeop-displayoperatorminheight5000.woff");
-  }
-  mo  {
-    font-family: TestFont;
-    font-size: 16px;
-  }
-</style>
-<script>
-  function getBox(aId) {
-    return document.getElementById(aId).getBoundingClientRect();
-  }
-
-  setup({ explicit_done: true });
-  window.addEventListener("load", () => { document.fonts.ready.then(runTests); });
-
-  function runTests() {
-
-    test(function() {
-      assert_true(MathMLFeatureDetection.has_operator_spacing());
-
-      let bbox = getBox("largeop");
-      let hit = document.getElementById("largeop");
-      let reference = getBox("reference");
-      assert_true(bbox.height > reference.height, "height of large op is bigger than the equivalent normal operator");
-      assert_equals(hit, document.elementFromPoint(bbox.left + 1, bbox.top + 1), "hit testing top-left corner of large op works");
-      assert_equals(hit, document.elementFromPoint(bbox.right - 1, bbox.bottom - 1), "hit testing bottom-right corner of large op works");
-    }, "Large op hit testing");
-
-    done();
-  }
-</script>
-</head>
-<body>
-  <math>
-    <mtable>
-      <mtr>
-        <mtd>
-          <mstyle displaystyle="false">
-            <mo id="reference">&#x2AFF;</mo>
-          </mstyle>
-        </mtd>
-        <mtd>
-          <mstyle displaystyle="true">
-            <mo id="largeop">&#x2AFF;</mo>
-          </mstyle>
-        </mtd>
-      </mtr>
-    </mtable>
-  </math>
-</body>
-</html>
diff --git a/testing/web-platform/tests/mathml/relations/css-styling/padding-border-margin/padding-border-margin-002-ref.html b/testing/web-platform/tests/mathml/relations/css-styling/padding-border-margin/padding-border-margin-002-ref.html
deleted file mode 100644
index e13a9f47ff4f..000000000000
--- a/testing/web-platform/tests/mathml/relations/css-styling/padding-border-margin/padding-border-margin-002-ref.html
+++ /dev/null
@@ -1,18 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8"/>
-<title>Padding/border/margin on largeop (reference)</title>
-<body>
-  <p>This test passes if you see a cyan rectangle of width 300px and
-    height 1500px, surrounded by a 10px blue padding, surrounded by a 10px
-    blue/yellow dashed border, itself
-    surrounded by a 10px pink margin.</p>
-  </div>
-    <div style="background: pink; position: absolute; left: 10px; top: 4em;">
-      <div style="background: blue; border: 10px dashed yellow; padding: 10px; margin: 10px;">
-        <div style="width: 300px; height: 1500px; background: cyan;"></div>
-      </div>
-    </div>
-</body>
-</html>
diff --git a/testing/web-platform/tests/mathml/relations/css-styling/padding-border-margin/padding-border-margin-002.html b/testing/web-platform/tests/mathml/relations/css-styling/padding-border-margin/padding-border-margin-002.html
deleted file mode 100644
index 1ccfbb7005fa..000000000000
--- a/testing/web-platform/tests/mathml/relations/css-styling/padding-border-margin/padding-border-margin-002.html
+++ /dev/null
@@ -1,34 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<meta charset="utf-8"/>
-<title>Padding/border/margin on largeop</title>
-<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#layout-algorithms">
-<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#the-math-style-property">
-<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#layout-of-operators">
-<link rel="match" href="padding-border-margin-002-ref.html"/>
-<meta name="assert" content="Verify visual rendering of padding/border/margin on a displaystyle mo element with the largeop property.">
-<style>
-  @font-face {
-    font-family: TestFont;
-    src: url("/fonts/math/largeop-displayoperatorminheight5000.woff");
-  }
-  math  {
-    /* Largeop variant for U+2AFF has width 100px
-       and height 300 * 5000 / 1000 = 1500px */
-    font-family: TestFont;
-    font-size: 300px;
-  }
-</style>
-<body>
-  <p>This test passes if you see a cyan rectangle of width 300px and
-    height 1500px, surrounded by a 10px blue padding, surrounded by a 10px
-    blue/yellow dashed border, itself
-    surrounded by a 10px pink margin.</p>
-  <div style="background: pink; position: absolute; left: 10px; top: 4em;">
-    <math displaystyle="true">
-      <mo largeop="true" lspace="0" rspace="0" style="background: blue; border: 10px dashed yellow; padding: 10px; margin: 10px; color: cyan;">&#x2AFF;</mo>
-    </math>
-  </div>
-</body>
-</html>
