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diff --git a/testing/web-platform/tests/html/browsers/the-window-object/open-close/open-features-negative-innerwidth-innerheight.html b/testing/web-platform/tests/html/browsers/the-window-object/open-close/open-features-negative-innerwidth-innerheight.html
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+++ b/testing/web-platform/tests/html/browsers/the-window-object/open-close/open-features-negative-innerwidth-innerheight.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>HTML: window.open `features`: negative values for legacy `innerwidth`, `innerheight`</title>
+<meta name=timeout content=long>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#apis-for-creating-and-navigating-browsing-contexts-by-name">
+
+<!-- user agents are not required to support open features other than `noopener`
+     and on some platforms position and size features don't make sense -->
+<meta name="flags" content="may" />
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/PrefixedPostMessage.js"></script>
+<script>
+var windowURL = 'resources/message-opener.html';
+var featuresPrefix = `top=0,left=0,`;
+
+// https://html.spec.whatwg.org/multipage/infrastructure.html#rules-for-parsing-integers
+
+setup (() => {
+  // Before running tests, open a window using features that mimic
+  // what would happen if the features tested here were set to invalid
+  // values in later tests.
+  // In cases where the value for `innerwidth` or `innerheight` is
+  // is less than the browser's minimum allowed value for that dimension,
+  // but NOT 0, the value affected will become the browser's minimum allowed value.
+
+  // This should result in a minimally-sized window for later comparison
+  var featureString = `${featuresPrefix}innerwidth=1,innerheight=1`;
+  var prefixedMessage = new PrefixedMessageTest();
+  prefixedMessage.onMessage((data, e) => {
+    e.source.close();
+    runWindowTests(data);
+  });
+  var win = window.open(prefixedMessage.url(windowURL), '', featureString);
+});
+
+function runWindowTests (baselineDimensions) {
+
+  // Negative values for `innerwidth` should result in a window with minimum
+  // valid allowed width
+  [ 'innerwidth=-404',
+    'innerwidth=-404.5',
+    'innerwidth=-404e1'
+  ].forEach(feature => {
+    async_test(t => {
+      var prefixedMessage = new PrefixedMessageTest();
+      var featureString = `${featuresPrefix}height=405,${feature}`;
+      prefixedMessage.onMessage(t.step_func_done((data, e) => {
+        e.source.close();
+        assert_equals(data.width, baselineDimensions.width, `"${feature} is negative and should result in a minimally-wide window"`);
+      }));
+      var win = window.open(prefixedMessage.url(windowURL) + "&expected_innerWidth=" + baselineDimensions.width, '', featureString);
+    }, `features "${feature}" should NOT set "width=404"`);
+  });
+
+  // Negative values for `innerheight` should result in a window with minimum
+  // valid allowed height
+  [ 'innerheight=-404',
+    'innerheight=-404.5',
+    'innerheight=-404e1'
+  ].forEach(feature => {
+    async_test(t => {
+      var prefixedMessage = new PrefixedMessageTest();
+      var featureString = `${featuresPrefix}width=404,${feature}`;
+      prefixedMessage.onMessage(t.step_func_done((data, e) => {
+        e.source.close();
+        assert_equals(data.height, baselineDimensions.height, `"${feature} is negative and should result in a minimal-height window"`);
+      }));
+      var win = window.open(prefixedMessage.url(windowURL) + '&expected_innerHeight=' + baselineDimensions.height, '', featureString);
+    }, `features "${feature}" should NOT set "height=404"`);
+  });
+}
+
+</script>